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 incomlete Gamma function with negative argument		  New Topic  Reply to Topic
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LionAM

Germany
11 Posts
Posted - 07/21/2010 :  06:30:08 AM  Show Profile  Edit Topic  Reply with Quote  View user's IP address  Delete Topic
Origin 8 SR 6:
Operating System: Win XP

Hello,
how can I calculate the incomplete Gamma function using Origin C for a negative Exponent - in my case e.g. Gamma(-1, 0.01)?
The NAG-function incomplete_gamma is normalized - which does not make sense for these parameters as gamma(-1) diverges - but the incomplete gamma function does not include the singularity and is therefore well-defined.

Alex

Penn

China
644 Posts
Posted - 07/23/2010 :  03:58:12 AM  Show Profile  Edit Reply  Reply with Quote  View user's IP address  Delete Reply
Hi Alex,

The incomplete_gamma function needs two parameters satisfy a>0 and x>=0. The situation you mentioned is not supported.

Penn
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