csgn.c File Reference

#include "prim.h"

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Functions
double	csgn (complex z)
	Complex signum. More...

Function Documentation

csgn()

double csgn

(

complex

z

)

Complex signum.

More info is available at Wikipedia:
https://wikipedia.org/wiki/Sign_function#Complex_signum

Definition at line 38 of file csgn.c.

References cimag(), and creal().

Referenced by ComplexNumber::Signum().

{
    double a = creal(z);

    if (a > 0.0)
    {
        return 1.0;
    }
    else if (a < 0.0)
    {
        return -1.0;
    }
    else
    {
        double b = cimag(z);
        return b > 0.0 ? 1.0 : b < 0.0 ? -1.0 : 0.0;
    }
}

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