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Last change
on this file since 3224 was 1392, checked in by bird, 22 years ago |
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This commit was generated by cvs2svn to compensate for changes in r1391,
which included commits to RCS files with non-trunk default branches.
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Property cvs2svn:cvs-rev
set to
1.1.1.2
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Property svn:eol-style
set to
native
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Property svn:executable
set to
*
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File size:
500 bytes
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| 1 | #include "f2c.h"
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| 2 |
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| 3 | #undef abs
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| 4 | #include <math.h>
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| 5 | extern double f__cabs (double, double);
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| 6 | void
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| 7 | pow_zz (doublecomplex * r, doublecomplex * a, doublecomplex * b)
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| 8 | {
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| 9 | double logr, logi, x, y;
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| 10 |
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| 11 | if (a->r == 0.0 && a->i == 0.0)
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| 12 | {
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| 13 | /* Algorithm below doesn't cope. */
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| 14 | r->r = r->i = 0.0;
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| 15 | return;
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| 16 | }
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| 17 | logr = log (f__cabs (a->r, a->i));
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| 18 | logi = atan2 (a->i, a->r);
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| 19 |
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| 20 | x = exp (logr * b->r - logi * b->i);
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| 21 | y = logr * b->i + logi * b->r;
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| 22 |
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| 23 | r->r = x * cos (y);
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| 24 | r->i = x * sin (y);
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| 25 | }
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