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Last change
on this file was 1392, checked in by bird, 21 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
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*
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File size:
737 bytes
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| 1 | #include "f2c.h"
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| 2 |
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| 3 | extern void z_div (doublecomplex *, doublecomplex *, doublecomplex *);
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| 4 | void
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| 5 | pow_zi (doublecomplex * p, doublecomplex * a, integer * b) /* p = a**b */
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| 6 | {
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| 7 | integer n;
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| 8 | unsigned long u;
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| 9 | double t;
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| 10 | doublecomplex q, x;
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| 11 | static doublecomplex one = { 1.0, 0.0 };
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| 12 |
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| 13 | n = *b;
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| 14 | q.r = 1;
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| 15 | q.i = 0;
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| 16 |
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| 17 | if (n == 0)
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| 18 | goto done;
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| 19 | if (n < 0)
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| 20 | {
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| 21 | n = -n;
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| 22 | z_div (&x, &one, a);
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| 23 | }
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| 24 | else
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| 25 | {
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| 26 | x.r = a->r;
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| 27 | x.i = a->i;
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| 28 | }
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| 29 |
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| 30 | for (u = n;;)
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| 31 | {
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| 32 | if (u & 01)
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| 33 | {
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| 34 | t = q.r * x.r - q.i * x.i;
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| 35 | q.i = q.r * x.i + q.i * x.r;
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| 36 | q.r = t;
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| 37 | }
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| 38 | if (u >>= 1)
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| 39 | {
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| 40 | t = x.r * x.r - x.i * x.i;
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| 41 | x.i = 2 * x.r * x.i;
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| 42 | x.r = t;
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| 43 | }
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| 44 | else
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| 45 | break;
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| 46 | }
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| 47 | done:
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| 48 | p->i = q.i;
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| 49 | p->r = q.r;
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| 50 | }
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