Return the mapping parameters.
The returned values define a linear map
off + scl*x that is applied to the input arguments before the series is evaluated. The map depends on the
window; if the current
domain is equal to the
window the resulting map is the identity. If the coefficients of the series instance are to be used by themselves outside this class, then the linear function must be substituted for the
x in the standard representation of the base polynomials.
If the current domain is the interval
[l1, r1] and the window is
[l2, r2], then the linear mapping function
L is defined by the equations:
L(l1) = l2 L(r1) = r2
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