bfqad bfqad_r bsqad pchia pchid pfqad pfqad_r ppqad

ppqad() void ppqad ( int  ldc, double  c[], double  xi[], int  lxi, int  k, double  x1, double  x2, double *  pquad, int *  info  ) Integral of PP (piecewise polynomial) form of B-spline Purpose This routine computes the integral on [x1, x2] of a k-th order B-spline using the piecewise polynomial representation (c[][], xi[], lxi, k). Here the Taylor expansion about the left end point xi[j-1] of the j-th interval is integrated and evaluated on subintervals of [x1, x2] which are formed by included break points. Integration outside [xi[0], xi[lxi]] is permitted. Parameters [in] ldc Leading dimension of the two dimensional array c[][] (ldc >= k) [in] c[][] Array c[lc][ldc] (lc >= lxi) Right derivatives at break points. [in] xi[] Array xi[l_xi] (l_xi >= lxi + 1) Break points. [in] lxi Number of polynomial pieces. [in] k Order of B-spline. (k >= 1) [in] x1 Lower end point of quadrature interval. (Normally xi[0] <= x1 <= xi[lxi]) [in] x2 Upper end point of quadrature interval. (Normally xi[0] <= x2 <= xi[lxi]) [out] pquad Integral of the B-spline over [x1, x2]. [out] info = 0: Successful exit = -1: The argument ldc had an illegal value (ldc < k) = -4: The argument lxi had an illegal value (lxi < 1) = -5: The argument k had an illegal value (k < 1) Reference SLATEC