169 lines
4.0 KiB
C++
169 lines
4.0 KiB
C++
/* fortran/dasum.f -- translated by f2c (version 20200916).
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You must link the resulting object file with libf2c:
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on Microsoft Windows system, link with libf2c.lib;
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on Linux or Unix systems, link with .../path/to/libf2c.a -lm
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or, if you install libf2c.a in a standard place, with -lf2c -lm
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-- in that order, at the end of the command line, as in
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cc *.o -lf2c -lm
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Source for libf2c is in /netlib/f2c/libf2c.zip, e.g.,
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http://www.netlib.org/f2c/libf2c.zip
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*/
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#ifdef __cplusplus
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extern "C" {
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#endif
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#include "lmp_f2c.h"
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/* > \brief \b DASUM */
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/* =========== DOCUMENTATION =========== */
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/* Online html documentation available at */
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/* http://www.netlib.org/lapack/explore-html/ */
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/* Definition: */
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/* =========== */
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/* DOUBLE PRECISION FUNCTION DASUM(N,DX,INCX) */
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/* .. Scalar Arguments .. */
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/* INTEGER INCX,N */
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/* .. */
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/* .. Array Arguments .. */
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/* DOUBLE PRECISION DX(*) */
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/* .. */
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/* > \par Purpose: */
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/* ============= */
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/* > */
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/* > \verbatim */
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/* > */
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/* > DASUM takes the sum of the absolute values. */
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/* > \endverbatim */
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/* Arguments: */
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/* ========== */
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/* > \param[in] N */
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/* > \verbatim */
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/* > N is INTEGER */
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/* > number of elements in input vector(s) */
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/* > \endverbatim */
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/* > */
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/* > \param[in] DX */
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/* > \verbatim */
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/* > DX is DOUBLE PRECISION array, dimension ( 1 + ( N - 1 )*abs( INCX ) ) */
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/* > \endverbatim */
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/* > */
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/* > \param[in] INCX */
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/* > \verbatim */
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/* > INCX is INTEGER */
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/* > storage spacing between elements of DX */
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/* > \endverbatim */
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/* Authors: */
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/* ======== */
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/* > \author Univ. of Tennessee */
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/* > \author Univ. of California Berkeley */
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/* > \author Univ. of Colorado Denver */
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/* > \author NAG Ltd. */
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/* > \ingroup double_blas_level1 */
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/* > \par Further Details: */
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/* ===================== */
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/* > */
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/* > \verbatim */
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/* > */
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/* > jack dongarra, linpack, 3/11/78. */
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/* > modified 3/93 to return if incx .le. 0. */
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/* > modified 12/3/93, array(1) declarations changed to array(*) */
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/* > \endverbatim */
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/* > */
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/* ===================================================================== */
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doublereal dasum_(integer *n, doublereal *dx, integer *incx)
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{
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/* System generated locals */
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integer i__1, i__2;
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doublereal ret_val, d__1, d__2, d__3, d__4, d__5, d__6;
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/* Local variables */
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integer i__, m, mp1;
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doublereal dtemp;
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integer nincx;
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/* -- Reference BLAS level1 routine -- */
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/* -- Reference BLAS is a software package provided by Univ. of Tennessee, -- */
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/* -- Univ. of California Berkeley, Univ. of Colorado Denver and NAG Ltd..-- */
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/* .. Scalar Arguments .. */
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/* .. */
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/* .. Array Arguments .. */
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/* .. */
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/* ===================================================================== */
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/* .. Local Scalars .. */
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/* .. */
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/* .. Intrinsic Functions .. */
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/* .. */
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/* Parameter adjustments */
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--dx;
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/* Function Body */
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ret_val = 0.;
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dtemp = 0.;
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if (*n <= 0 || *incx <= 0) {
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return ret_val;
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}
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if (*incx == 1) {
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/* code for increment equal to 1 */
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/* clean-up loop */
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m = *n % 6;
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if (m != 0) {
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i__1 = m;
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for (i__ = 1; i__ <= i__1; ++i__) {
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dtemp += (d__1 = dx[i__], abs(d__1));
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}
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if (*n < 6) {
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ret_val = dtemp;
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return ret_val;
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}
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}
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mp1 = m + 1;
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i__1 = *n;
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for (i__ = mp1; i__ <= i__1; i__ += 6) {
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dtemp = dtemp + (d__1 = dx[i__], abs(d__1)) + (d__2 = dx[i__ + 1],
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abs(d__2)) + (d__3 = dx[i__ + 2], abs(d__3)) + (d__4 =
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dx[i__ + 3], abs(d__4)) + (d__5 = dx[i__ + 4], abs(d__5))
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+ (d__6 = dx[i__ + 5], abs(d__6));
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}
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} else {
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/* code for increment not equal to 1 */
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nincx = *n * *incx;
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i__1 = nincx;
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i__2 = *incx;
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for (i__ = 1; i__2 < 0 ? i__ >= i__1 : i__ <= i__1; i__ += i__2) {
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dtemp += (d__1 = dx[i__], abs(d__1));
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}
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}
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ret_val = dtemp;
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return ret_val;
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/* End of DASUM */
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} /* dasum_ */
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#ifdef __cplusplus
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}
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#endif
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