Return to c_div.c CVS log

Up to [CSRG BSD Unix] / 42BSD / usr.lib / libF77

Annotation of 42BSD/usr.lib/libF77/c_div.c, revision 1.1.1.1

1.1       root        1: /*
                      2:  *     "@(#)c_div.c    1.1"
                      3:  */
                      4: 
                      5: #include "complex"
                      6: 
                      7: c_div(c, a, b)
                      8: complex *a, *b, *c;
                      9: {
                     10: double ratio, den;
                     11: double abr, abi;
                     12: 
                     13: if( (abr = b->real) < 0.)
                     14:        abr = - abr;
                     15: if( (abi = b->imag) < 0.)
                     16:        abi = - abi;
                     17: if( abr <= abi )
                     18:        {
                     19:        if(abi == 0)
                     20:                abort(); /* fatal("complex division by zero"); */
                     21:        ratio = b->real / b->imag ;
                     22:        den = b->imag * (1 + ratio*ratio);
                     23:        c->real = (a->real*ratio + a->imag) / den;
                     24:        c->imag = (a->imag*ratio - a->real) / den;
                     25:        }
                     26: 
                     27: else
                     28:        {
                     29:        ratio = b->imag / b->real ;
                     30:        den = b->real * (1 + ratio*ratio);
                     31:        c->real = (a->real + a->imag*ratio) / den;
                     32:        c->imag = (a->imag - a->real*ratio) / den;
                     33:        }
                     34: 
                     35: }

This archive runs on limited infrastructure. Preserving old code on modern bandwidth. Automated agents are requested to crawl responsibly.