📄 cheby_c.mht
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Date: Wed, 27 Sep 2006 22:49:27 +0800
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<BODY><PRE>/* cheby.c - Chebyshev polynomial \(C\sb{N}(x)\) */
#include <math.h>
double cheby(N, x) /* usage: y =3D =
cheby(N, x); */
int N; /* \(N\) =3D polynomial =
order */
double x; /* \(x\) must be =
non-negative */
{
if (x <=3D 1)
return cos(N * acos(x));
else
return cosh(N * log(x + sqrt(x*x-1)));
}
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