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This algorithm may be used to compute the Chebyshev series coefficients for a function F which is continuous on the interval [-1,1], as noted in [1]. For this purpose, function CCQUAD would be called with A --1 , B = 1, and appropriate values of TOLERR and LIMIT. (For some applications, one would prefer instead to state the number of Chebyshev series coefficients desired.) The comments in function CCQUAD indicate that the array CSXFRM contains, on return, N = USED 1 times the discrete cosine transform of F. Therefore, the values

Remark on “Algorithm 424: Clenshaw-Curtis Quadrature [O1]”