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Re: negative absolute error given by qag?


Francisco J Molina writes:
 > Do you know how I can avoid the error:
 > 
 > roundoff error prevents tolerance from being achieved?

Hi,

Some strategies for difficult integrals are discussed in the QUADPACK
manual (referenced in the GSL integration chapter).  Usually it comes
down to rewriting the integral to reduce numerical cancellations.

regards
Brian


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