CHEBYSHEV Function

Standard Library function that implements the forward and reverse Chebyshev polynomial expansion of a set of data.

Usage

result = CHEBYSHEV(data, ntype)

Input Parameters

data—The input data (either the original dataset or the Chebyshev polynomial expansion, depending upon ntype).

ntype—The numeric type to be returned:

• –1—To return the set of Chebyshev polynomials.

• +1—To return the original data.

Returned Value

result—The numeric type specified by ntype.

Keywords

None.

Discussion

CHEBYSHEV uses a straightforward implementation of the recursion formula. If you use discontinuous data, the result is subject to round-off error.