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Annotation of researchv10no/libF77/old/z_sqrt.c, revision 1.1.1.1

1.1       root        1: #include "f2c.h"
                      2: 
                      3: VOID z_sqrt(r, z)
                      4: doublecomplex *r, *z;
                      5: {
                      6: double mag, sqrt(), cabs();
                      7: 
                      8: if( (mag = cabs(z->r, z->i)) == 0.)
                      9:        r->r = r->i = 0.;
                     10: else if(z->r > 0)
                     11:        {
                     12:        r->r = sqrt(0.5 * (mag + z->r) );
                     13:        r->i = z->i / r->r / 2;
                     14:        }
                     15: else
                     16:        {
                     17:        r->i = sqrt(0.5 * (mag - z->r) );
                     18:        if(z->i < 0)
                     19:                z->i = - z->i;
                     20:        r->r = z->i / r->i / 2;
                     21:        }
                     22: }

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