Fitlag Polcof Polint Polyvl

Polyvl() Sub Polyvl ( Nder As  Long, XX As  Double, Yfit As  Double, Yp() As  Double, N As  Long, X() As  Double, C() As  Double, Info As  Long  ) Value of polynomial and derivatives Purpose This routine calculates the value of a polynomial and its first Nder derivatives where the polynomial was produced by a previous call to polint. Parameters [in] Nder The number of derivatives to be evaluated. (Nder >= 0) [in] XX The argument at which the polynomial and its derivatives are to be evaluated. [out] Yfit The value of the polynomial at XX. [out] Yp() Array Yp(LYp - 1) (LYp >= Nder) The derivatives of the polynomial at XX of order 1 to Nder. [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 - 1) (LX >= N) The array of abscissas (must remain unchanged between the call to Polint and the call to Polcof). [out] C() Array C(LC - 1) (LC >= N) An array of information produced by subroutines Polint (must remain unchanged between the call to Polint and the call to Polcof). [out] Info = 0: Successful exit. = -1: The argument Nder had an illegal value. (Nder < 0) = -4: The argument Yp() is invalid. = -5: The argument N had an illegal value. (N < 1) = -6: The argument X() is invalid. = -7: The argument C() is invalid. Reference SLATEC Example Program See example of Polint.