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93 lines
1.9 KiB
93 lines
1.9 KiB
/* isamax.f -- translated by f2c (version 20061008). |
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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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#include "clapack.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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integer i__, ix; |
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real smax; |
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/* .. Scalar Arguments .. */ |
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/* .. */ |
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/* .. Array Arguments .. */ |
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/* .. */ |
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/* Purpose */ |
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/* ======= */ |
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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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/* .. 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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--sx; |
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/* Function Body */ |
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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__ <= i__1; ++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__ <= i__1; ++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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