47 lines
1.0 KiB
C++
47 lines
1.0 KiB
C++
#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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integer idamax_(integer *n, doublereal *dx, integer *incx)
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{
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integer ret_val, i__1;
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doublereal d__1;
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integer i__, ix;
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doublereal dmax__;
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--dx;
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ret_val = 0;
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if (*n < 1 || *incx <= 0) {
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return ret_val;
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}
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ret_val = 1;
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if (*n == 1) {
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return ret_val;
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}
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if (*incx == 1) {
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dmax__ = abs(dx[1]);
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i__1 = *n;
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for (i__ = 2; i__ <= i__1; ++i__) {
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if ((d__1 = dx[i__], abs(d__1)) > dmax__) {
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ret_val = i__;
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dmax__ = (d__1 = dx[i__], abs(d__1));
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}
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}
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} else {
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ix = 1;
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dmax__ = abs(dx[1]);
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ix += *incx;
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i__1 = *n;
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for (i__ = 2; i__ <= i__1; ++i__) {
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if ((d__1 = dx[ix], abs(d__1)) > dmax__) {
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ret_val = i__;
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dmax__ = (d__1 = dx[ix], abs(d__1));
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}
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ix += *incx;
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}
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}
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return ret_val;
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}
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#ifdef __cplusplus
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}
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#endif
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