banfac banslv bint4 bintk bspldr bsplev bsplpp bsplvd bsplvn bvalue interv ppvalu

bspldr() void bspldr ( double  t[], double  a[], int  n, int  k, int  nderiv, double  ad[], int *  info  ) Construct a divided difference table from B-representation for derivative calculation by bsplev Purpose This routine uses the B-representation (t[], a[], n, k) to construct a divided difference table adif preparatory to a (right) derivative calculation in bsplev. The lower triangular matrix adif is stored in vector ad[] by columns. The arrays are related by   adif(i, j) = ad[i-j+1 + (2*n-j+2)*(j-1)/2 - 1], i = j to n, j = 1 to nderiv Parameters [in] t[] Array t[lt] (lt >= n + k) Knot vector. [in] a[] Array a[la] (la >= n) B-spline coefficients. [in] n Number of B-spline coefficients. (n = sum of knot multiplicities - k) [in] k Order of B-spline. (k >= 1) [in] nderiv Number of the derivatives. (1 <= nderiv <= k) nderiv = 1 returns the zero-th derivative = function value. [out] ad[] Array ad[lad] (lad >= (2*n - nderiv + 1)*nderiv/2) Divided difference table for input to bsplev. [out] info = 0: Successful exit = -3: The argument n had an illegal value (n < k) = -4: The argument k had an illegal value (k < 1) = -5: The argument nderiv had an illegal value (nderiv < 1 or nderiv > k) Reference SLATEC