The CHEBYSHEV function returns the forward or reverse Chebyshev polynomial expansion of a set of data. Note: Results from this function are subject to roundoff error given discontinuous data.

This routine is written in the IDL language. Its source code can be found in the file chebyshev.pro in the lib subdirectory of the IDL distribution.

Syntax

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Result = CHEBYSHEV(D, N)

Return Value

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Returns the forward or reverse Chebyshev polynomial expansion of a set of data.

Arguments

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D

A vector containing the values at the zeros of Chebyshev polynomial.

N

A flag that, if set to -1, returns a set of Chebyshev polynomials. If set to +1, the original data is returned.

Keywords

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None.

Version History

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Original

Introduced

See Also

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FFT, WTN