mirror of https://github.com/opencv/opencv.git
Open Source Computer Vision Library
https://opencv.org/
You can not select more than 25 topics
Topics must start with a letter or number, can include dashes ('-') and can be up to 35 characters long.
81 lines
1.5 KiB
81 lines
1.5 KiB
15 years ago
|
#include "clapack.h"
|
||
|
|
|
||
|
|
integer idamax_(integer *n, doublereal *dx, integer *incx)
|
||
|
|
{
|
||
|
|
/* System generated locals */
|
||
|
|
integer ret_val, i__1;
|
||
|
|
doublereal d__1;
|
||
|
|
|
||
|
|
/* Local variables */
|
||
|
|
integer i__, ix;
|
||
|
|
doublereal dmax__;
|
||
|
|
|
||
|
|
/* .. Scalar Arguments .. */
|
||
|
|
/* .. */
|
||
|
|
/* .. Array Arguments .. */
|
||
|
|
/* .. */
|
||
|
|
|
||
|
|
/* Purpose */
|
||
|
|
/* ======= */
|
||
|
|
|
||
|
|
/* finds the index of element having max. absolute value. */
|
||
|
|
/* jack dongarra, linpack, 3/11/78. */
|
||
|
|
/* modified 3/93 to return if incx .le. 0. */
|
||
|
|
/* modified 12/3/93, array(1) declarations changed to array(*) */
|
||
|
|
|
||
|
|
|
||
|
|
/* .. Local Scalars .. */
|
||
|
|
/* .. */
|
||
|
|
/* .. Intrinsic Functions .. */
|
||
|
|
/* .. */
|
||
|
|
/* Parameter adjustments */
|
||
|
|
--dx;
|
||
|
|
|
||
|
|
/* Function Body */
|
||
|
|
ret_val = 0;
|
||
|
|
if (*n < 1 || *incx <= 0) {
|
||
|
|
return ret_val;
|
||
|
|
}
|
||
|
|
ret_val = 1;
|
||
|
|
if (*n == 1) {
|
||
|
|
return ret_val;
|
||
|
|
}
|
||
|
|
if (*incx == 1) {
|
||
|
|
goto L20;
|
||
|
|
}
|
||
|
|
|
||
|
|
/* code for increment not equal to 1 */
|
||
|
|
|
||
|
|
ix = 1;
|
||
|
|
dmax__ = abs(dx[1]);
|
||
|
|
ix += *incx;
|
||
|
|
i__1 = *n;
|
||
|
|
for (i__ = 2; i__ <= i__1; ++i__) {
|
||
|
|
if ((d__1 = dx[ix], abs(d__1)) <= dmax__) {
|
||
|
|
goto L5;
|
||
|
|
}
|
||
|
|
ret_val = i__;
|
||
|
|
dmax__ = (d__1 = dx[ix], abs(d__1));
|
||
|
|
L5:
|
||
|
|
ix += *incx;
|
||
|
|
/* L10: */
|
||
|
|
}
|
||
|
|
return ret_val;
|
||
|
|
|
||
|
|
/* code for increment equal to 1 */
|
||
|
|
|
||
|
|
L20:
|
||
|
|
dmax__ = abs(dx[1]);
|
||
|
|
i__1 = *n;
|
||
|
|
for (i__ = 2; i__ <= i__1; ++i__) {
|
||
|
|
if ((d__1 = dx[i__], abs(d__1)) <= dmax__) {
|
||
|
|
goto L30;
|
||
|
|
}
|
||
|
|
ret_val = i__;
|
||
|
|
dmax__ = (d__1 = dx[i__], abs(d__1));
|
||
|
|
L30:
|
||
|
|
;
|
||
|
|
}
|
||
|
|
return ret_val;
|
||
|
|
} /* idamax_ */
|