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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:
490 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 |
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| 7 | void
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| 8 | c_sqrt (complex * r, complex * z)
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| 9 | {
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| 10 | double mag, t;
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| 11 | double zi = z->i, zr = z->r;
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| 12 |
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| 13 | if ((mag = f__cabs (zr, zi)) == 0.)
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| 14 | r->r = r->i = 0.;
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| 15 | else if (zr > 0)
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| 16 | {
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| 17 | r->r = t = sqrt (0.5 * (mag + zr));
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| 18 | t = zi / t;
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| 19 | r->i = 0.5 * t;
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| 20 | }
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| 21 | else
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| 22 | {
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| 23 | t = sqrt (0.5 * (mag - zr));
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| 24 | if (zi < 0)
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| 25 | t = -t;
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| 26 | r->i = t;
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| 27 | t = zi / t;
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| 28 | r->r = 0.5 * t;
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| 29 | }
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| 30 | }
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