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Last change
on this file since 603 was 2, checked in by bird, 23 years ago |
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Initial revision
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-
Property cvs2svn:cvs-rev
set to
1.1
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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:
514 bytes
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| 1 | #include "f2c.h"
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| 2 |
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| 3 | #ifdef KR_headers
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| 4 | double sqrt(), f__cabs();
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| 5 | VOID z_sqrt(r, z) doublecomplex *r, *z;
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| 6 | #else
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| 7 | #undef abs
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| 8 | #include "math.h"
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| 9 | extern double f__cabs(double, double);
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| 10 | void z_sqrt(doublecomplex *r, doublecomplex *z)
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| 11 | #endif
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| 12 | {
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| 13 | double mag, zi = z->i, zr = z->r;
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| 14 |
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| 15 | if( (mag = f__cabs(zr, zi)) == 0.)
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| 16 | r->r = r->i = 0.;
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| 17 | else if(zr > 0)
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| 18 | {
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| 19 | r->r = sqrt(0.5 * (mag + zr) );
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| 20 | r->i = zi / r->r / 2;
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| 21 | }
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| 22 | else
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| 23 | {
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| 24 | r->i = sqrt(0.5 * (mag - zr) );
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| 25 | if(zi < 0)
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| 26 | r->i = - r->i;
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| 27 | r->r = zi / r->i / 2;
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| 28 | }
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| 29 | }
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