core.math

Builtin mathematical intrinsics

Source

core/math.d

License:

Boost License 1.0.

Authors:

Walter Bright, Don Clugston

nothrow @nogc @safe real rndtonl(real x);

Returns x rounded to a long value using the FE_TONEAREST rounding mode. If the integer value of x is greater than long.max, the result is indeterminate.

pure nothrow @nogc @safe float cos(float x);

pure nothrow @nogc @safe double cos(double x);

pure nothrow @nogc @safe real cos(real x);

Returns cosine of x. x is in radians.

Special Values

x	cos(x)	invalid?
NAN	NAN	yes
±∞	NAN	yes

Bugs:

Results are undefined if |x| >= 2⁶⁴.

pure nothrow @nogc @safe float sin(float x);

pure nothrow @nogc @safe double sin(double x);

pure nothrow @nogc @safe real sin(real x);

Returns sine of x. x is in radians.

Special Values

x	sin(x)	invalid?
NAN	NAN	yes
±0.0	±0.0	no
±∞	NAN	yes

Bugs:

Results are undefined if |x| >= 2⁶⁴.

pure nothrow @nogc @safe long rndtol(float x);

pure nothrow @nogc @safe long rndtol(double x);

pure nothrow @nogc @safe long rndtol(real x);

Returns x rounded to a long value using the current rounding mode. If the integer value of x is greater than long.max, the result is indeterminate.

pure nothrow @nogc @safe float sqrt(float x);

pure nothrow @nogc @safe double sqrt(double x);

pure nothrow @nogc @safe real sqrt(real x);

Compute square root of x.

Special Values

x	sqrt(x)	invalid?
-0.0	-0.0	no
<0.0	NAN	yes
+∞	+∞	no

pure nothrow @nogc @safe float ldexp(float n, int exp);

pure nothrow @nogc @safe double ldexp(double n, int exp);

pure nothrow @nogc @safe real ldexp(real n, int exp);

Compute n * 2^exp

References

frexp

pure nothrow @nogc @safe float fabs(float x);

Compute the absolute value.

Special Values

x	fabs(x)
±0.0	+0.0
±∞	+∞

It is implemented as a compiler intrinsic.

Parameters:

float x

floating point value

Returns:

|x|

References

equivalent to std.math.fabs

pure nothrow @nogc @safe double fabs(double x);

ditto

Compute the absolute value.

Special Values

x	fabs(x)
±0.0	+0.0
±∞	+∞

It is implemented as a compiler intrinsic.

Parameters:

double x

floating point value

Returns:

|x|

References

equivalent to std.math.fabs

pure nothrow @nogc @safe real fabs(real x);

ditto

Compute the absolute value.

Special Values

x	fabs(x)
±0.0	+0.0
±∞	+∞

It is implemented as a compiler intrinsic.

Parameters:

real x

floating point value

Returns:

|x|

References

equivalent to std.math.fabs

pure nothrow @nogc @safe float rint(float x);

pure nothrow @nogc @safe double rint(double x);

pure nothrow @nogc @safe real rint(real x);

Rounds x to the nearest integer value, using the current rounding mode. If the return value is not equal to x, the FE_INEXACT exception is raised. nearbyint performs the same operation, but does not set the FE_INEXACT exception.

pure nothrow @nogc @safe float yl2x(float x, float y);

pure nothrow @nogc @safe double yl2x(double x, double y);

pure nothrow @nogc @safe real yl2x(real x, real y);

pure nothrow @nogc @safe double yl2xp1(double x, double y);

pure nothrow @nogc @safe real yl2xp1(real x, real y);

Building block functions, they translate to a single x87 instruction.

T toPrec(T : float)(float f);

T toPrec(T : float)(double f);

T toPrec(T : float)(real f);

T toPrec(T : double)(float f);

T toPrec(T : double)(double f);

T toPrec(T : double)(real f);

T toPrec(T : real)(float f);

T toPrec(T : real)(double f);

T toPrec(T : real)(real f);

Round argument to a specific precision.

D language types specify only a minimum precision, not a maximum. The toPrec() function forces rounding of the argument f to the precision of the specified floating point type T. The rounding mode used is inevitably target-dependent, but will be done in a way to maximize accuracy. In most cases, the default is round-to-nearest.

Parameters:

T	precision type to round to
float f	value to convert

Returns:

f in precision of type T