Copy constructor

Construct a row of column vector with fixed size from an arbitrary number of coefficients. [c++11]

This is only for vectors (either row-vectors or column-vectors), i.e. matrices which are known at compile-time to have either one row or one column.

This constructor is for 1D array or vectors with more than 4 coefficients. There exists C++98 analogue constructors for fixed-size array/vector having 1, 2, 3, or 4 coefficients.

Warning

To construct a column (resp. row) vector of fixed length, the number of values passed to this constructor must match the the fixed number of rows (resp. columns) of *this.

See also

PlainObjectBase::operator=(const EigenBase<OtherDerived>&)

See also

PlainObjectBase::operator=(const EigenBase<OtherDerived>&)

Resizes to the given size, and sets all coefficients in this expression to the given value val.

This is only for vectors (either row-vectors or column-vectors), i.e. matrices which are known at compile-time to have either one row or one column.

Example:

VectorXf v;
v.setConstant(3, 5);
cout << v << endl;

Output:

5
5
5

See also

MatrixBase::setConstant(const Scalar&), setConstant(Index,Index,const Scalar&), class CwiseNullaryOp, MatrixBase::Constant(const Scalar&)

Resizes to the given size, and sets all coefficients in this expression to the given value val.

This is only for vectors (either row-vectors or column-vectors), i.e. matrices which are known at compile-time to have either one row or one column.

Example:

VectorXf v;
v.setConstant(3, 5);
cout << v << endl;

Output:

5
5
5

See also

MatrixBase::setConstant(const Scalar&), setConstant(Index,Index,const Scalar&), class CwiseNullaryOp, MatrixBase::Constant(const Scalar&)

Resizes to the given size, and sets all coefficients in this expression to the given value val.

This is only for vectors (either row-vectors or column-vectors), i.e. matrices which are known at compile-time to have either one row or one column.

Example:

VectorXf v;
v.setConstant(3, 5);
cout << v << endl;

Output:

5
5
5

See also

MatrixBase::setConstant(const Scalar&), setConstant(Index,Index,const Scalar&), class CwiseNullaryOp, MatrixBase::Constant(const Scalar&)

Resizes to the given size, and sets all coefficients in this expression to the given value val.

This is only for vectors (either row-vectors or column-vectors), i.e. matrices which are known at compile-time to have either one row or one column.

Example:

VectorXf v;
v.setConstant(3, 5);
cout << v << endl;

Output:

5
5
5

See also

MatrixBase::setConstant(const Scalar&), setConstant(Index,Index,const Scalar&), class CwiseNullaryOp, MatrixBase::Constant(const Scalar&)

Resizes to the given size, and sets all coefficients in this expression to the given value val.

This is only for vectors (either row-vectors or column-vectors), i.e. matrices which are known at compile-time to have either one row or one column.

Example:

VectorXf v;
v.setConstant(3, 5);
cout << v << endl;

Output:

5
5
5

See also

MatrixBase::setConstant(const Scalar&), setConstant(Index,Index,const Scalar&), class CwiseNullaryOp, MatrixBase::Constant(const Scalar&)

Resizes to the given size, and sets all coefficients in this expression to the given value val.

This is only for vectors (either row-vectors or column-vectors), i.e. matrices which are known at compile-time to have either one row or one column.

Example:

VectorXf v;
v.setConstant(3, 5);
cout << v << endl;

Output:

5
5
5

See also

MatrixBase::setConstant(const Scalar&), setConstant(Index,Index,const Scalar&), class CwiseNullaryOp, MatrixBase::Constant(const Scalar&)

Resizes to the given size, and sets all coefficients in this expression to the given value val.

This is only for vectors (either row-vectors or column-vectors), i.e. matrices which are known at compile-time to have either one row or one column.

Example:

VectorXf v;
v.setConstant(3, 5);
cout << v << endl;

Output:

5
5
5

See also

MatrixBase::setConstant(const Scalar&), setConstant(Index,Index,const Scalar&), class CwiseNullaryOp, MatrixBase::Constant(const Scalar&)

Resizes to the given size, and sets all coefficients in this expression to the given value val.

This is only for vectors (either row-vectors or column-vectors), i.e. matrices which are known at compile-time to have either one row or one column.

Example:

VectorXf v;
v.setConstant(3, 5);
cout << v << endl;

Output:

5
5
5

See also

MatrixBase::setConstant(const Scalar&), setConstant(Index,Index,const Scalar&), class CwiseNullaryOp, MatrixBase::Constant(const Scalar&)

Resizes to the given size, and sets all coefficients in this expression to the given value val.

This is only for vectors (either row-vectors or column-vectors), i.e. matrices which are known at compile-time to have either one row or one column.

Example:

VectorXf v;
v.setConstant(3, 5);
cout << v << endl;

Output:

5
5
5

See also

MatrixBase::setConstant(const Scalar&), setConstant(Index,Index,const Scalar&), class CwiseNullaryOp, MatrixBase::Constant(const Scalar&)

Resizes to the given size, and sets all coefficients in this expression to the given value val.

This is only for vectors (either row-vectors or column-vectors), i.e. matrices which are known at compile-time to have either one row or one column.

Example:

VectorXf v;
v.setConstant(3, 5);
cout << v << endl;

Output:

5
5
5

See also

MatrixBase::setConstant(const Scalar&), setConstant(Index,Index,const Scalar&), class CwiseNullaryOp, MatrixBase::Constant(const Scalar&)

Resizes to the given size, and sets all coefficients in this expression to the given value val.

This is only for vectors (either row-vectors or column-vectors), i.e. matrices which are known at compile-time to have either one row or one column.

Example:

VectorXf v;
v.setConstant(3, 5);
cout << v << endl;

Output:

5
5
5

See also

MatrixBase::setConstant(const Scalar&), setConstant(Index,Index,const Scalar&), class CwiseNullaryOp, MatrixBase::Constant(const Scalar&)

Resizes to the given size, and sets all coefficients in this expression to the given value val.

This is only for vectors (either row-vectors or column-vectors), i.e. matrices which are known at compile-time to have either one row or one column.

Example:

VectorXf v;
v.setConstant(3, 5);
cout << v << endl;

Output:

5
5
5

See also

MatrixBase::setConstant(const Scalar&), setConstant(Index,Index,const Scalar&), class CwiseNullaryOp, MatrixBase::Constant(const Scalar&)

Resizes to the given size, and sets all coefficients in this expression to the given value val.

This is only for vectors (either row-vectors or column-vectors), i.e. matrices which are known at compile-time to have either one row or one column.

Example:

VectorXf v;
v.setConstant(3, 5);
cout << v << endl;

Output:

5
5
5

See also

MatrixBase::setConstant(const Scalar&), setConstant(Index,Index,const Scalar&), class CwiseNullaryOp, MatrixBase::Constant(const Scalar&)

Resizes to the given size, and sets all coefficients in this expression to the given value val.

This is only for vectors (either row-vectors or column-vectors), i.e. matrices which are known at compile-time to have either one row or one column.

Example:

VectorXf v;
v.setConstant(3, 5);
cout << v << endl;

Output:

5
5
5

See also

MatrixBase::setConstant(const Scalar&), setConstant(Index,Index,const Scalar&), class CwiseNullaryOp, MatrixBase::Constant(const Scalar&)

Resizes to the given size, and sets all coefficients in this expression to the given value val.

This is only for vectors (either row-vectors or column-vectors), i.e. matrices which are known at compile-time to have either one row or one column.

Example:

VectorXf v;
v.setConstant(3, 5);
cout << v << endl;

Output:

5
5
5

See also

MatrixBase::setConstant(const Scalar&), setConstant(Index,Index,const Scalar&), class CwiseNullaryOp, MatrixBase::Constant(const Scalar&)

Copies the value of the expression other into *this with automatic resizing.

*this might be resized to match the dimensions of other. If *this was a null matrix (not already initialized), it will be initialized.

Note that copying a row-vector into a vector (and conversely) is allowed. The resizing, if any, is then done in the appropriate way so that row-vectors remain row-vectors and vectors remain vectors.

See also

operator=(const MatrixBase<OtherDerived>&), _set_noalias()

Resizes to the given size, and sets all coefficients in this expression to the given value val.

This is only for vectors (either row-vectors or column-vectors), i.e. matrices which are known at compile-time to have either one row or one column.

Example:

VectorXf v;
v.setConstant(3, 5);
cout << v << endl;

Output:

5
5
5

See also

MatrixBase::setConstant(const Scalar&), setConstant(Index,Index,const Scalar&), class CwiseNullaryOp, MatrixBase::Constant(const Scalar&)

This is an overloaded version of DenseCoeffsBase<Derived,ReadOnlyAccessors>::coeff(Index) const provided to by-pass the creation of an evaluator of the expression, thus saving compilation efforts.

See DenseCoeffsBase<Derived,ReadOnlyAccessors>::coeff(Index) const for details.

This is an overloaded version of DenseCoeffsBase<Derived,ReadOnlyAccessors>::coeff(Index,Index) const provided to by-pass the creation of an evaluator of the expression, thus saving compilation efforts.

See DenseCoeffsBase<Derived,ReadOnlyAccessors>::coeff(Index) const for details.

This is an overloaded version of DenseCoeffsBase<Derived,WriteAccessors>::coeffRef(Index) const provided to by-pass the creation of an evaluator of the expression, thus saving compilation efforts.

See DenseCoeffsBase<Derived,WriteAccessors>::coeffRef(Index) const for details.

This is the const version of coeffRef(Index) which is thus synonym of coeff(Index). It is provided for convenience.

This is an overloaded version of DenseCoeffsBase<Derived,WriteAccessors>::coeffRef(Index,Index) const provided to by-pass the creation of an evaluator of the expression, thus saving compilation efforts.

See DenseCoeffsBase<Derived,WriteAccessors>::coeffRef(Index,Index) const for details.

This is the const version of coeffRef(Index,Index) which is thus synonym of coeff(Index,Index). It is provided for convenience.

Resizes the matrix to rows x cols while leaving old values untouched.

The method is intended for matrices of dynamic size. If you only want to change the number of rows and/or of columns, you can use conservativeResize(NoChange_t, Index) or conservativeResize(Index, NoChange_t).

Matrices are resized relative to the top-left element. In case values need to be appended to the matrix they will be uninitialized.

Resizes the matrix to rows x cols while leaving old values untouched.

As opposed to conservativeResize(Index rows, Index cols), this version leaves the number of columns unchanged.

In case the matrix is growing, new rows will be uninitialized.

Resizes the vector to size while retaining old values.

This is only for vectors (either row-vectors or column-vectors), i.e. matrices which are known at compile-time to have either one row or one column.. This method does not work for partially dynamic matrices when the static dimension is anything other than 1. For example it will not work with Matrix<double, 2, Dynamic>.

When values are appended, they will be uninitialized.

Resizes the matrix to rows x cols while leaving old values untouched.

As opposed to conservativeResize(Index rows, Index cols), this version leaves the number of rows unchanged.

In case the matrix is growing, new columns will be uninitialized.

Resizes the matrix to rows x cols of other, while leaving old values untouched.

The method is intended for matrices of dynamic size. If you only want to change the number of rows and/or of columns, you can use conservativeResize(NoChange_t, Index) or conservativeResize(Index, NoChange_t).

Matrices are resized relative to the top-left element. In case values need to be appended to the matrix they will copied from other.

Returns

a pointer to the data array of this matrix

Returns

a const pointer to the data array of this matrix

See also

MatrixBase::lazyAssign()

Resizes to the given size, and sets all coefficients in this expression to the given value val.

This is only for vectors (either row-vectors or column-vectors), i.e. matrices which are known at compile-time to have either one row or one column.

Example:

VectorXf v;
v.setConstant(3, 5);
cout << v << endl;

Output:

5
5
5

See also

MatrixBase::setConstant(const Scalar&), setConstant(Index,Index,const Scalar&), class CwiseNullaryOp, MatrixBase::Constant(const Scalar&)

Resizes to the given size, and sets all coefficients in this expression to the given value val.

This is only for vectors (either row-vectors or column-vectors), i.e. matrices which are known at compile-time to have either one row or one column.

Example:

VectorXf v;
v.setConstant(3, 5);
cout << v << endl;

Output:

5
5
5

See also

MatrixBase::setConstant(const Scalar&), setConstant(Index,Index,const Scalar&), class CwiseNullaryOp, MatrixBase::Constant(const Scalar&)

Resizes to the given size, and sets all coefficients in this expression to the given value val.

This is only for vectors (either row-vectors or column-vectors), i.e. matrices which are known at compile-time to have either one row or one column.

Example:

VectorXf v;
v.setConstant(3, 5);
cout << v << endl;

Output:

5
5
5

See also

MatrixBase::setConstant(const Scalar&), setConstant(Index,Index,const Scalar&), class CwiseNullaryOp, MatrixBase::Constant(const Scalar&)

Resizes to the given size, and sets all coefficients in this expression to the given value val.

This is only for vectors (either row-vectors or column-vectors), i.e. matrices which are known at compile-time to have either one row or one column.

Example:

VectorXf v;
v.setConstant(3, 5);
cout << v << endl;

Output:

5
5
5

See also

MatrixBase::setConstant(const Scalar&), setConstant(Index,Index,const Scalar&), class CwiseNullaryOp, MatrixBase::Constant(const Scalar&)

Resizes to the given size, and sets all coefficients in this expression to the given value val.

This is only for vectors (either row-vectors or column-vectors), i.e. matrices which are known at compile-time to have either one row or one column.

Example:

VectorXf v;
v.setConstant(3, 5);
cout << v << endl;

Output:

5
5
5

See also

MatrixBase::setConstant(const Scalar&), setConstant(Index,Index,const Scalar&), class CwiseNullaryOp, MatrixBase::Constant(const Scalar&)

Resizes to the given size, and sets all coefficients in this expression to the given value val.

This is only for vectors (either row-vectors or column-vectors), i.e. matrices which are known at compile-time to have either one row or one column.

Example:

VectorXf v;
v.setConstant(3, 5);
cout << v << endl;

Output:

5
5
5

See also

MatrixBase::setConstant(const Scalar&), setConstant(Index,Index,const Scalar&), class CwiseNullaryOp, MatrixBase::Constant(const Scalar&)

Resizes to the given size, and sets all coefficients in this expression to the given value val.

This is only for vectors (either row-vectors or column-vectors), i.e. matrices which are known at compile-time to have either one row or one column.

Example:

VectorXf v;
v.setConstant(3, 5);
cout << v << endl;

Output:

5
5
5

See also

MatrixBase::setConstant(const Scalar&), setConstant(Index,Index,const Scalar&), class CwiseNullaryOp, MatrixBase::Constant(const Scalar&)

Resizes to the given size, and sets all coefficients in this expression to the given value val.

This is only for vectors (either row-vectors or column-vectors), i.e. matrices which are known at compile-time to have either one row or one column.

Example:

VectorXf v;
v.setConstant(3, 5);
cout << v << endl;

Output:

5
5
5

See also

MatrixBase::setConstant(const Scalar&), setConstant(Index,Index,const Scalar&), class CwiseNullaryOp, MatrixBase::Constant(const Scalar&)

Resizes to the given size, and sets all coefficients in this expression to the given value val.

This is only for vectors (either row-vectors or column-vectors), i.e. matrices which are known at compile-time to have either one row or one column.

Example:

VectorXf v;
v.setConstant(3, 5);
cout << v << endl;

Output:

5
5
5

See also

MatrixBase::setConstant(const Scalar&), setConstant(Index,Index,const Scalar&), class CwiseNullaryOp, MatrixBase::Constant(const Scalar&)

Resizes to the given size, and sets all coefficients in this expression to the given value val.

This is only for vectors (either row-vectors or column-vectors), i.e. matrices which are known at compile-time to have either one row or one column.

Example:

VectorXf v;
v.setConstant(3, 5);
cout << v << endl;

Output:

5
5
5

See also

MatrixBase::setConstant(const Scalar&), setConstant(Index,Index,const Scalar&), class CwiseNullaryOp, MatrixBase::Constant(const Scalar&)

Resizes to the given size, and sets all coefficients in this expression to the given value val.

This is only for vectors (either row-vectors or column-vectors), i.e. matrices which are known at compile-time to have either one row or one column.

Example:

VectorXf v;
v.setConstant(3, 5);
cout << v << endl;

Output:

5
5
5

See also

MatrixBase::setConstant(const Scalar&), setConstant(Index,Index,const Scalar&), class CwiseNullaryOp, MatrixBase::Constant(const Scalar&)

Resizes to the given size, and sets all coefficients in this expression to the given value val.

This is only for vectors (either row-vectors or column-vectors), i.e. matrices which are known at compile-time to have either one row or one column.

Example:

VectorXf v;
v.setConstant(3, 5);
cout << v << endl;

Output:

5
5
5

See also

MatrixBase::setConstant(const Scalar&), setConstant(Index,Index,const Scalar&), class CwiseNullaryOp, MatrixBase::Constant(const Scalar&)

Resizes to the given size, and sets all coefficients in this expression to the given value val.

This is only for vectors (either row-vectors or column-vectors), i.e. matrices which are known at compile-time to have either one row or one column.

Example:

VectorXf v;
v.setConstant(3, 5);
cout << v << endl;

Output:

5
5
5

See also

MatrixBase::setConstant(const Scalar&), setConstant(Index,Index,const Scalar&), class CwiseNullaryOp, MatrixBase::Constant(const Scalar&)

Resizes to the given size, and sets all coefficients in this expression to the given value val.

This is only for vectors (either row-vectors or column-vectors), i.e. matrices which are known at compile-time to have either one row or one column.

Example:

VectorXf v;
v.setConstant(3, 5);
cout << v << endl;

Output:

5
5
5

See also

MatrixBase::setConstant(const Scalar&), setConstant(Index,Index,const Scalar&), class CwiseNullaryOp, MatrixBase::Constant(const Scalar&)

Resizes to the given size, and sets all coefficients in this expression to the given value val.

This is only for vectors (either row-vectors or column-vectors), i.e. matrices which are known at compile-time to have either one row or one column.

Example:

VectorXf v;
v.setConstant(3, 5);
cout << v << endl;

Output:

5
5
5

See also

MatrixBase::setConstant(const Scalar&), setConstant(Index,Index,const Scalar&), class CwiseNullaryOp, MatrixBase::Constant(const Scalar&)

Resizes to the given size, and sets all coefficients in this expression to the given value val.

This is only for vectors (either row-vectors or column-vectors), i.e. matrices which are known at compile-time to have either one row or one column.

Example:

VectorXf v;
v.setConstant(3, 5);
cout << v << endl;

Output:

5
5
5

See also

MatrixBase::setConstant(const Scalar&), setConstant(Index,Index,const Scalar&), class CwiseNullaryOp, MatrixBase::Constant(const Scalar&)

Resizes to the given size, and sets all coefficients in this expression to the given value val.

This is only for vectors (either row-vectors or column-vectors), i.e. matrices which are known at compile-time to have either one row or one column.

Example:

VectorXf v;
v.setConstant(3, 5);
cout << v << endl;

Output:

5
5
5

See also

MatrixBase::setConstant(const Scalar&), setConstant(Index,Index,const Scalar&), class CwiseNullaryOp, MatrixBase::Constant(const Scalar&)

Resizes to the given size, and sets all coefficients in this expression to the given value val.

This is only for vectors (either row-vectors or column-vectors), i.e. matrices which are known at compile-time to have either one row or one column.

Example:

VectorXf v;
v.setConstant(3, 5);
cout << v << endl;

Output:

5
5
5

See also

MatrixBase::setConstant(const Scalar&), setConstant(Index,Index,const Scalar&), class CwiseNullaryOp, MatrixBase::Constant(const Scalar&)

Resizes to the given size, and sets all coefficients in this expression to the given value val.

This is only for vectors (either row-vectors or column-vectors), i.e. matrices which are known at compile-time to have either one row or one column.

Example:

VectorXf v;
v.setConstant(3, 5);
cout << v << endl;

Output:

5
5
5

See also

MatrixBase::setConstant(const Scalar&), setConstant(Index,Index,const Scalar&), class CwiseNullaryOp, MatrixBase::Constant(const Scalar&)

Resizes to the given size, and sets all coefficients in this expression to the given value val.

This is only for vectors (either row-vectors or column-vectors), i.e. matrices which are known at compile-time to have either one row or one column.

Example:

VectorXf v;
v.setConstant(3, 5);
cout << v << endl;

Output:

5
5
5

See also

MatrixBase::setConstant(const Scalar&), setConstant(Index,Index,const Scalar&), class CwiseNullaryOp, MatrixBase::Constant(const Scalar&)

Resizes to the given size, and sets all coefficients in this expression to the given value val.

This is only for vectors (either row-vectors or column-vectors), i.e. matrices which are known at compile-time to have either one row or one column.

Example:

VectorXf v;
v.setConstant(3, 5);
cout << v << endl;

Output:

5
5
5

See also

MatrixBase::setConstant(const Scalar&), setConstant(Index,Index,const Scalar&), class CwiseNullaryOp, MatrixBase::Constant(const Scalar&)

Resizes to the given size, and sets all coefficients in this expression to the given value val.

This is only for vectors (either row-vectors or column-vectors), i.e. matrices which are known at compile-time to have either one row or one column.

Example:

VectorXf v;
v.setConstant(3, 5);
cout << v << endl;

Output:

5
5
5

See also

MatrixBase::setConstant(const Scalar&), setConstant(Index,Index,const Scalar&), class CwiseNullaryOp, MatrixBase::Constant(const Scalar&)

Resizes to the given size, and sets all coefficients in this expression to the given value val.

This is only for vectors (either row-vectors or column-vectors), i.e. matrices which are known at compile-time to have either one row or one column.

Example:

VectorXf v;
v.setConstant(3, 5);
cout << v << endl;

Output:

5
5
5

See also

MatrixBase::setConstant(const Scalar&), setConstant(Index,Index,const Scalar&), class CwiseNullaryOp, MatrixBase::Constant(const Scalar&)

Resizes to the given size, and sets all coefficients in this expression to the given value val.

This is only for vectors (either row-vectors or column-vectors), i.e. matrices which are known at compile-time to have either one row or one column.

Example:

VectorXf v;
v.setConstant(3, 5);
cout << v << endl;

Output:

5
5
5

See also

MatrixBase::setConstant(const Scalar&), setConstant(Index,Index,const Scalar&), class CwiseNullaryOp, MatrixBase::Constant(const Scalar&)

Copies the generic expression other into *this.

The expression must provide a (templated) evalTo(Derived& dst) const function which does the actual job. In practice, this allows any user to write its own special matrix without having to modify MatrixBase

Returns

a reference to *this.

This is a special case of the templated operator=. Its purpose is to prevent a default operator= from hiding the templated operator=.

Resizes *this to a rows x cols matrix.

This method is intended for dynamic-size matrices, although it is legal to call it on any matrix as long as fixed dimensions are left unchanged. If you only want to change the number of rows and/or of columns, you can use resize(NoChange_t, Index), resize(Index, NoChange_t).

If the current number of coefficients of *this exactly matches the product rows * cols, then no memory allocation is performed and the current values are left unchanged. In all other cases, including shrinking, the data is reallocated and all previous values are lost.

Example:

MatrixXd m(2,3);
m << 1,2,3,4,5,6;
cout << "here's the 2x3 matrix m:" << endl << m << endl;
cout << "let's resize m to 3x2. This is a conservative resizing because 2*3==3*2." << endl;
m.resize(3,2);
cout << "here's the 3x2 matrix m:" << endl << m << endl;
cout << "now let's resize m to size 2x2. This is NOT a conservative resizing, so it becomes uninitialized:" << endl;
m.resize(2,2);
cout << m << endl;

Output:

here's the 2x3 matrix m:
1 2 3
4 5 6
let's resize m to 3x2. This is a conservative resizing because 2*3==3*2.
here's the 3x2 matrix m:
1 5
4 3
2 6
now let's resize m to size 2x2. This is NOT a conservative resizing, so it becomes uninitialized:
0 0
0 0

See also

resize(Index) for vectors, resize(NoChange_t, Index), resize(Index, NoChange_t)

Resizes the matrix, changing only the number of rows. For the parameter of type NoChange_t, just pass the special value NoChange as in the example below.

Example:

MatrixXd m(3,4);
m.resize(5, NoChange);
cout << "m: " << m.rows() << " rows, " << m.cols() << " cols" << endl;

Output:

m: 5 rows, 4 cols

See also

resize(Index,Index)

Resizes *this to a vector of length size

This is only for vectors (either row-vectors or column-vectors), i.e. matrices which are known at compile-time to have either one row or one column.. This method does not work for partially dynamic matrices when the static dimension is anything other than 1. For example it will not work with Matrix<double, 2, Dynamic>.

Example:

VectorXd v(10);
v.resize(3);
RowVector3d w;
w.resize(3); // this is legal, but has no effect
cout << "v: " << v.rows() << " rows, " << v.cols() << " cols" << endl;
cout << "w: " << w.rows() << " rows, " << w.cols() << " cols" << endl;

Output:

v: 3 rows, 1 cols
w: 1 rows, 3 cols

See also

resize(Index,Index), resize(NoChange_t, Index), resize(Index, NoChange_t)

Resizes the matrix, changing only the number of columns. For the parameter of type NoChange_t, just pass the special value NoChange as in the example below.

Example:

MatrixXd m(3,4);
m.resize(NoChange, 5);
cout << "m: " << m.rows() << " rows, " << m.cols() << " cols" << endl;

Output:

m: 3 rows, 5 cols

See also

resize(Index,Index)

Resizes *this to have the same dimensions as other. Takes care of doing all the checking that's needed.

Note that copying a row-vector into a vector (and conversely) is allowed. The resizing, if any, is then done in the appropriate way so that row-vectors remain row-vectors and vectors remain vectors.

Resizes to the given size, and sets all coefficients in this expression to the given value val.

Parameters

rows	the new number of rows
cols	the new number of columns
val	the value to which all coefficients are set

Example:

MatrixXf m;
m.setConstant(3, 3, 5);
cout << m << endl;

Output:

5 5 5
5 5 5
5 5 5

See also

MatrixBase::setConstant(const Scalar&), setConstant(Index,const Scalar&), class CwiseNullaryOp, MatrixBase::Constant(const Scalar&)

Resizes to the given size, changing only the number of rows, and sets all coefficients in this expression to the given value val. For the parameter of type NoChange_t, just pass the special value NoChange.

See also

MatrixBase::setConstant(const Scalar&), setConstant(Index,const Scalar&), class CwiseNullaryOp, MatrixBase::Constant(const Scalar&)

Resizes to the given size, and sets all coefficients in this expression to the given value val.

This is only for vectors (either row-vectors or column-vectors), i.e. matrices which are known at compile-time to have either one row or one column.

Example:

VectorXf v;
v.setConstant(3, 5);
cout << v << endl;

Output:

5
5
5

See also

MatrixBase::setConstant(const Scalar&), setConstant(Index,Index,const Scalar&), class CwiseNullaryOp, MatrixBase::Constant(const Scalar&)

Resizes to the given size, changing only the number of columns, and sets all coefficients in this expression to the given value val. For the parameter of type NoChange_t, just pass the special value NoChange.

See also

MatrixBase::setConstant(const Scalar&), setConstant(Index,const Scalar&), class CwiseNullaryOp, MatrixBase::Constant(const Scalar&)

Resizes to the given size, and sets all coefficients in this expression to one.

Parameters

rows	the new number of rows
cols	the new number of columns

Example:

MatrixXf m;
m.setOnes(3, 3);
cout << m << endl;

Output:

1 1 1
1 1 1
1 1 1

See also

MatrixBase::setOnes(), setOnes(Index), class CwiseNullaryOp, MatrixBase::Ones()

Resizes to the given size, changing only the number of rows, and sets all coefficients in this expression to one. For the parameter of type NoChange_t, just pass the special value NoChange.

See also

MatrixBase::setOnes(), setOnes(Index), setOnes(Index, Index), setOnes(NoChange_t, Index), class CwiseNullaryOp, MatrixBase::Ones()

Resizes to the given newSize, and sets all coefficients in this expression to one.

This is only for vectors (either row-vectors or column-vectors), i.e. matrices which are known at compile-time to have either one row or one column.

Example:

VectorXf v;
v.setOnes(3);
cout << v << endl;

Output:

1
1
1

See also

MatrixBase::setOnes(), setOnes(Index,Index), class CwiseNullaryOp, MatrixBase::Ones()

Resizes to the given size, changing only the number of columns, and sets all coefficients in this expression to one. For the parameter of type NoChange_t, just pass the special value NoChange.

See also

MatrixBase::setOnes(), setOnes(Index), setOnes(Index, Index), setOnes(Index, NoChange_t) class CwiseNullaryOp, MatrixBase::Ones()

Resizes to the given size, and sets all coefficients in this expression to random values.

Numbers are uniformly spread through their whole definition range for integer types, and in the [-1:1] range for floating point scalar types.

Warning

This function is not re-entrant.

Parameters

rows	the new number of rows
cols	the new number of columns

Example:

MatrixXf m;
m.setRandom(3, 3);
cout << m << endl;

Output:

  0.68  0.597  -0.33
-0.211  0.823  0.536
 0.566 -0.605 -0.444

See also

DenseBase::setRandom(), setRandom(Index), class CwiseNullaryOp, DenseBase::Random()

Resizes to the given size, changing only the number of rows, and sets all coefficients in this expression to random values. For the parameter of type NoChange_t, just pass the special value NoChange.

Numbers are uniformly spread through their whole definition range for integer types, and in the [-1:1] range for floating point scalar types.

Warning

This function is not re-entrant.

See also

DenseBase::setRandom(), setRandom(Index), setRandom(NoChange_t, Index), class CwiseNullaryOp, DenseBase::Random()

Resizes to the given newSize, and sets all coefficients in this expression to random values.

Numbers are uniformly spread through their whole definition range for integer types, and in the [-1:1] range for floating point scalar types.

This is only for vectors (either row-vectors or column-vectors), i.e. matrices which are known at compile-time to have either one row or one column.

Warning

This function is not re-entrant.

Example:

VectorXf v;
v.setRandom(3);
cout << v << endl;

Output:

  0.68
-0.211
 0.566

See also

DenseBase::setRandom(), setRandom(Index,Index), class CwiseNullaryOp, DenseBase::Random()

Resizes to the given size, changing only the number of columns, and sets all coefficients in this expression to random values. For the parameter of type NoChange_t, just pass the special value NoChange.

Numbers are uniformly spread through their whole definition range for integer types, and in the [-1:1] range for floating point scalar types.

Warning

This function is not re-entrant.

See also

DenseBase::setRandom(), setRandom(Index), setRandom(Index, NoChange_t), class CwiseNullaryOp, DenseBase::Random()

Resizes to the given size, and sets all coefficients in this expression to zero.

Parameters

rows	the new number of rows
cols	the new number of columns

Example:

MatrixXf m;
m.setZero(3, 3);
cout << m << endl;

Output:

0 0 0
0 0 0
0 0 0

See also

DenseBase::setZero(), setZero(Index), class CwiseNullaryOp, DenseBase::Zero()

Resizes to the given size, changing only the number of rows, and sets all coefficients in this expression to zero. For the parameter of type NoChange_t, just pass the special value NoChange.

See also

DenseBase::setZero(), setZero(Index), setZero(Index, Index), setZero(NoChange_t, Index), class CwiseNullaryOp, DenseBase::Zero()

Resizes to the given size, and sets all coefficients in this expression to zero.

This is only for vectors (either row-vectors or column-vectors), i.e. matrices which are known at compile-time to have either one row or one column.

Example:

VectorXf v;
v.setZero(3);
cout << v << endl;

Output:

0
0
0

See also

DenseBase::setZero(), setZero(Index,Index), class CwiseNullaryOp, DenseBase::Zero()

Resizes to the given size, changing only the number of columns, and sets all coefficients in this expression to zero. For the parameter of type NoChange_t, just pass the special value NoChange.

See also

DenseBase::setZero(), setZero(Index), setZero(Index, Index), setZero(Index, NoChange_t), class CwiseNullaryOp, DenseBase::Zero()