MathGroup Archive 2005

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Problem with evaluation of Besel Functions


Hello
I am having a problem evaluating various functions, One example is the following

BesselJ[1.5, 0] evaluates to 0 but
(BesselJ[xx, yyy] /. xx -> 1.5) /. yyy -> 0 evaluates to complex infinity

I seem to encounter many of these problems with Bessel and Legendre
functions where I get actual diffrent numerical results depending on
How I set the parameters.
Thanks for anyone who might help
Ariel


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