Doxygen Source Code Documentation
c_sqrt.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_sqrt (complex *r, complex *z) |
Function Documentation
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Definition at line 12 of file c_sqrt.c.
00014 {
00015 double mag, t;
00016
00017 if( (mag = f__cabs(z->r, z->i)) == 0.)
00018 r->r = r->i = 0.;
00019 else if(z->r > 0)
00020 {
00021 r->r = t = sqrt(0.5 * (mag + z->r) );
00022 t = z->i / t;
00023 r->i = 0.5 * t;
00024 }
00025 else
00026 {
00027 t = sqrt(0.5 * (mag - z->r) );
00028 if(z->i < 0)
00029 t = -t;
00030 r->i = t;
00031 t = z->i / t;
00032 r->r = 0.5 * t;
00033 }
00034 }
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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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