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Annotation of 41BSD/lib/libF77/c_sqrt.c, revision 1.1

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

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