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[Bug-gsl] [bug #22651] arccosh for complex numbers - branch problem?

From: Brian Gough
Subject: [Bug-gsl] [bug #22651] arccosh for complex numbers - branch problem?
Date: Wed, 19 Nov 2008 09:17:19 +0000
User-agent: Mozilla/5.0 (X11; U; Linux i686; en-US; rv: Gecko/20080925 Fedora/false StumbleUpon/1.73 pango-text SeaMonkey/1.1.12

Update of bug #22651 (project gsl):

                  Status:               Need Info => Invalid                
             Open/Closed:                    Open => Closed                 
                 Release:                         => 1.11                   


Follow-up Comment #1:

The information given in the email was incorrect. GSL returns the correct
value +0.96 for both real and complex versions of the function.

#include <gsl/gsl_complex_math.h>
#include <math.h>
#include <stdio.h>

int main ()
  gsl_complex z,f;
  double x, y, zero = 0.0;
  x = 1.5;
  y = acosh(x);
  GSL_SET_COMPLEX(&z, x, zero);
  f = gsl_complex_arccosh(z);
  printf("%.18en", x);
  printf("%.18en", y);
  printf("%.18e %.18en", GSL_REAL(z), GSL_IMAG(z));
  printf("%.18e %.18en", GSL_REAL(f), GSL_IMAG(f));

$ ./a.out
1.500000000000000000e+00 0.000000000000000000e+00
9.624236501192069415e-01 -0.000000000000000000e+00


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