80 lines
1.4 KiB
C
80 lines
1.4 KiB
C
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/* -- translated by f2c (version 19940927).
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You must link the resulting object file with the libraries:
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-lf2c -lm (in that order)
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*/
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#include "f2c.h"
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integer isamax_(integer *n, real *sx, integer *incx)
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{
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/* System generated locals */
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integer ret_val, i__1;
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real r__1;
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/* Local variables */
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static real smax;
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static integer i, ix;
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/* finds the index of element having max. absolute value.
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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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Parameter adjustments
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Function Body */
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#define SX(I) sx[(I)-1]
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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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goto L20;
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}
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/* code for increment not equal to 1 */
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ix = 1;
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smax = dabs(SX(1));
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ix += *incx;
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i__1 = *n;
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for (i = 2; i <= *n; ++i) {
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if ((r__1 = SX(ix), dabs(r__1)) <= smax) {
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goto L5;
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}
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ret_val = i;
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smax = (r__1 = SX(ix), dabs(r__1));
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L5:
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ix += *incx;
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/* L10: */
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}
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return ret_val;
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/* code for increment equal to 1 */
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L20:
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smax = dabs(SX(1));
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i__1 = *n;
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for (i = 2; i <= *n; ++i) {
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if ((r__1 = SX(i), dabs(r__1)) <= smax) {
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goto L30;
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}
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ret_val = i;
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smax = (r__1 = SX(i), dabs(r__1));
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L30:
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;
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}
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return ret_val;
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} /* isamax_ */
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