From bug-request at octave dot org Fri Jun 17 00:16:00 2005
Subject: Re: make check fails in recent CVS
From: Geordie McBain <geordie dot mcbain at aeromech dot usyd dot edu dot au>
To: "Dmitri A. Sergatskov" <dasergatskov at gmail dot com>
Cc: bug at octave dot org
Date: Fri, 17 Jun 2005 15:15:24 +1000

On Thu, 2005-06-16 at 22:57 -0600, Dmitri A. Sergatskov wrote:
> John W. Eaton wrote:
> > On 16-Jun-2005, Dmitri A. Sergatskov wrote:
> > 
> > | Make check fails at:
> > | 
> > | EXEC: ../src/octave -f -q -H -p .:../src//:./../scripts// ./octave.test/arith/coth-1.m
> > | 
> > | Octave Output:
> > | ans = 0
> > | FAIL: octave.test/arith/coth-1.m
> > | ...
> > 
> > This does not fail for me.  Can you please provide find out what part
> 
> Looks like I have a problem with g++ library:
> [dima at localhost bug]$ cat test1.cc
> #include <complex>
> #include <iostream>
> #include <cmath>
> 
> using namespace std;
> 
> main()
> {
>          complex<double> x(0, 3.1415926535/2.0);
>          cout << "x = " << x << endl;
>          cout << "sinh(x) = " << sinh(x) << endl;
>          cout << "cosh(x) = " << cosh(x) << endl;
>          cout << "tanh(x) = " << tanh(x) << endl;
>          return 0;
> }
> 
> [dima at localhost bug]$ g++ test1.cc -o test1
> [dima at localhost bug]$ ./test1
> x = (0,1.5708)
> sinh(x) = (0,1)
> cosh(x) = (4.48966e-11,0)
> tanh(x) = (nan,inf)
> 
> (the correct answer is tanh(x) = (0,0))

Isn't it tanh (i*pi/2) = inf*i




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