mirror of
https://github.com/opencv/opencv.git
synced 2024-11-29 13:47:32 +08:00
94 lines
2.0 KiB
C
94 lines
2.0 KiB
C
/* idamax.f -- translated by f2c (version 20061008).
|
|
You must link the resulting object file with libf2c:
|
|
on Microsoft Windows system, link with libf2c.lib;
|
|
on Linux or Unix systems, link with .../path/to/libf2c.a -lm
|
|
or, if you install libf2c.a in a standard place, with -lf2c -lm
|
|
-- in that order, at the end of the command line, as in
|
|
cc *.o -lf2c -lm
|
|
Source for libf2c is in /netlib/f2c/libf2c.zip, e.g.,
|
|
|
|
http://www.netlib.org/f2c/libf2c.zip
|
|
*/
|
|
|
|
#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_ */
|