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[Bug-gsl] Bessel Jnu domain error

From: Cameron Williams
Subject: [Bug-gsl] Bessel Jnu domain error
Date: Thu, 17 May 2012 21:30:11 -0500

In the documentation, there are no specifications for the values of nu in
the evaluation of bessel_Jnu. However after running the command for nu < 0,
a domain error was shot at me. After looking at the source code, it indeed
shows that a domain error is thrown when nu < 0. The cylinder Bessel
function however is defined when nu < 0 (for x > 0), so the documentation
should reflect that the routines only work when nu >= 0. This caused a bit
of a headache for me today and I figured I'd spare someone else from this.

Can the case of nu < 0 be easily implemented numerically? I am going to go
through the source code and see if I can get it to work for nu < 0 over the
next day or two.

Cameron Williams

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