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authorMystery Man <unknown@mandriva.org>2004-02-20 00:03:26 +0000
committerMystery Man <unknown@mandriva.org>2004-02-20 00:03:26 +0000
commit959a1722faec6b30510c788c49dcb4b7cb96d1e0 (patch)
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-/*--------------------------------------------------------------------------*
-
-Name __poly - generates a polynomial from arguments
-
-Usage double __poly ( double x, int n, const double* c );
-
-Prototype in math.h
-
-Description __poly generates a polynomial in x, of degree n, with
- coefficients c[0], c[1], ..., c[n]. For example, if n=4,
- the generated polynomial is
-
- c[4]*x^4 + c[3]*x^3 + c[2]*x^2 + c[1]*x + c[0]
-
- The polynomial is calculated using Horner's method:
-
- polynom = (..((x*c[n] + c[n-1])*x + c[n-2])..)*x + c[0]
-
-Return value __poly returns the value of the polynomial as evaluated for
- the given x.
- A range error occurs if the result exceeds double range.
-
-*---------------------------------------------------------------------------*/
-
-#include <stdio.h>
-#include "dietlibm.h"
-
-double __poly ( double x, size_t n, const double* c)
-{
- long double ret;
- size_t i;
-
- i = n;
- c += n;
- ret = 0;
- do
- ret = ret * x + *c--;
- while ( i-- );
-
- return ret;
-}