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C++ API

: polyaffine (f, mu)

Return the coefficients of the polynomial vector f after an affine transformation.

If f is the vector representing the polynomial f(x), then g = polyaffine (f, mu) is the vector representing: 

g(x) = f( (x - mu(1)) / mu(2) )

See also: polyval, polyfit.

Demonstration 1

The following code

 f = [1/5 4/5 -7/5 -2];
 g = polyaffine (f, [1, 1.2]);
 x = linspace (-4,4,100);
 plot (x,polyval (f, x), x,polyval (g, x));
 legend ("original", "affine");
 axis ([-4 4 -3 5]);
 grid on;

Produces the following figure

Figure 1

Package: octave