fitlag polcof polint polyvl

polcof() void polcof ( double  xx, int  n, double  x[], double  c[], double  d[], double  work[]  ) Coefficients of polynomial interpolation Purpose This routine computes the coefficients of the polynomial fit produced by a previous call to polint. Parameters [in] xx The point about which the Taylor expansion is to be made. [in] n The number of data points (must remain unchanged between the call to polint and the call to polcof). [in] x[] Array x[lx] (lx >= n) The array of abscissas (must remain unchanged between the call to polint and the call to polcof). [out] c[] Array c[lc] (lc >= n) An array of information produced by subroutines polint (must remain unchanged between the call to polint and the call to polcof). [out] d[] Array d[ld] (ld >= n) The array of coefficients for the Taylor expansion about xx. p(z) = d[0] + d[1]*(z - xx) +d[2]*((z - xx)^2) + ... + d[n-1]*((z - xx)^(n-1)) [out] work[] Array work[lwork] (lwork >= 2*n) Work array. Reference SLATEC