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c_log.c File Reference

#include "f2c.h"
#include "mathh.h"

Go to the source code of this file.


Functions
double	f__cabs (double, double)
void	c_log (complex r, complex z)

Function Documentation

void c_log	(	complex *	r,
		complex *	z
	)

Definition at line 11 of file c_log.c.

References f__cabs(), and r.

00013 {
00014 r->i = atan2(z->i, z->r);
00015 r->r = log( f__cabs(z->r, z->i) );
00016 }

double f__cabs	(	double	,
		double
	)

Definition at line 7 of file cabs.c.

00009 {
00010 double temp;
00011 
00012 if(real < 0)
00013         real = -real;
00014 if(imag < 0)
00015         imag = -imag;
00016 if(imag > real){
00017         temp = real;
00018         real = imag;
00019         imag = temp;
00020 }
00021 if((real+imag) == real)
00022         return(real);
00023 
00024 temp = imag/real;
00025 temp = real*sqrt(1.0 + temp*temp);  /*overflow!!*/
00026 return(temp);
00027 }

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