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## Er:Re: [Bug-gsl] discontinuity in dilog function

**From**: |
Jim McElwaine |

**Subject**: |
Er:Re: [Bug-gsl] discontinuity in dilog function |

**Date**: |
Tue, 14 Sep 2004 10:01:31 +0100 |

I can't compile cvs
I updated automake, libtool and autoconf to latest versions
but when I run ./autogen.sh I get the following error
configure.ac:366: required file `cdf/Makefile.in' not found
Jim
Gerard Jungman writes:
>* *
>* Hi. Thanks.*
>* *
>* There used to be some argument reduction code in dilog.c, but*
>* it got commented out at some point. I don't know if I did it*
>* or somebody else did. Brian? That function was a bit of a mess.*
>* It may be fixed now. Fixes now in CVS. More testing is*
>* almost certainly needed.*
>* *
>* -- *
>* Gerard Jungman <address@hidden>*
>* Los Alamos National Laboratory*
>* *
>* *
>* On Fri, 2004-09-10 at 11:44, Jim McElwaine wrote:*
>* > The complex dilog function has a discontinuity at |x| = 1 *
>* > int the lower half plane if arg(x)<0 or arg(x)>pi*
>* > *
>* > gsl_sf_complex_dilog_e (r, q, Re(z), Im(z))*
>* > r = abs(x)*
>* > q = arg(x)*
>* > *
>* > q=-pi/2 r = .9 z = -0.1718 - 0.8360i*
>* > q=-pi/2 r = 1 z = -0.2056 - 0.9160i*
>* > q=-pi/2 r = 1.1 z = 9.6286 - 0.9931i XXXXXXX incorrect*
>* > *
>* > Note that in the upper half plane there is no problem*
>* > q=pi/2 r = .9 z = -0.1718 + 0.8360i*
>* > q=pi/2 r = 1 z = -0.2056 + 0.9160i*
>* > q=pi/2 r = 1.1 z = -0.2410 + 0.9931i *
>* > *
>* > Jim*
>* *
>* *
>* *
--
Dr. Jim McElwaine
H0.15, Department of Applied Maths and Theoretical Physics
Centre for Mathematical Sciences, Cambridge University
Wilberforce Road, Cambridge, CB3 0WA
email: address@hidden
http://www.damtp.cam.ac.uk/user/jnm11/
office +44 1223 337858
college +44 1223 339787
home +44 1223 710497