Takes the Chebyshev interpolation coefficients and returns the corresponding function samples.
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Syntax |
Description |
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out=icht(coeff,option); |
Returns function samples from Chebyshev interpolation coefficients coeff. Option: If option=1 is selected, the vector x will not include the endpoints If option=2 is selected, the vector x will include the endpoints |
Example
This example shows how to obtain interpolation coefficients from a sampled function and then calculate back the function samples from the coefficients.
Nc = 15; # Number of sample points xmin = 0; xmax = 1; x = chpts(xmin,xmax,Nc,1); # Returns Chebyshev roots grid on interval between xmin and xmax f = exp(1i*2*pi*x); # Function sampling using Chebyshev grid coeff = dcht(f,1); # Get interpolation coefficients # Calculate the function samples from the coefficients and compare them to the original function samples ?icht(coeff,1); ?f;
See Also