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77 lines
1.4 KiB
77 lines
1.4 KiB
#include "clapack.h" |
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/* Subroutine */ int srot_(integer *n, real *sx, integer *incx, real *sy, |
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integer *incy, real *c__, real *s) |
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{ |
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/* System generated locals */ |
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integer i__1; |
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/* Local variables */ |
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integer i__, ix, iy; |
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real stemp; |
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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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/* applies a plane rotation. */ |
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/* Further Details */ |
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/* =============== */ |
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/* jack dongarra, linpack, 3/11/78. */ |
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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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/* Parameter adjustments */ |
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--sy; |
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--sx; |
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/* Function Body */ |
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if (*n <= 0) { |
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return 0; |
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} |
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if (*incx == 1 && *incy == 1) { |
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goto L20; |
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} |
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/* code for unequal increments or equal increments not equal */ |
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/* to 1 */ |
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ix = 1; |
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iy = 1; |
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if (*incx < 0) { |
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ix = (-(*n) + 1) * *incx + 1; |
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} |
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if (*incy < 0) { |
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iy = (-(*n) + 1) * *incy + 1; |
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} |
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i__1 = *n; |
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for (i__ = 1; i__ <= i__1; ++i__) { |
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stemp = *c__ * sx[ix] + *s * sy[iy]; |
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sy[iy] = *c__ * sy[iy] - *s * sx[ix]; |
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sx[ix] = stemp; |
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ix += *incx; |
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iy += *incy; |
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/* L10: */ |
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} |
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return 0; |
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/* code for both increments equal to 1 */ |
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L20: |
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i__1 = *n; |
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for (i__ = 1; i__ <= i__1; ++i__) { |
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stemp = *c__ * sx[i__] + *s * sy[i__]; |
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sy[i__] = *c__ * sy[i__] - *s * sx[i__]; |
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sx[i__] = stemp; |
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/* L30: */ |
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} |
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return 0; |
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} /* srot_ */
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