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jeffj
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Post subject: Number of intervals and function evaluations: Gauss-Kronrod  Posted: Tue May 27, 2014 7:06 pm |
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Joined: Tue May 27, 2014 7:01 pm
Posts: 2
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I'm under the impression that autogkintegrate with autogksmooth uses Gauss-Kronrod quadrature. The purpose of Kronrod rules is to reduce the number of function evaluations. Why does autogkreport.nintervals = 74 while autogkreport.nfev = 2205? Shouldn't there be fewer function evaluations?
Last edited by jeffj on Tue May 27, 2014 10:45 pm, edited 1 time in total.
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jeffj
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Post subject: Re: Number of intervals and function evaluations: Gauss-Kron Posted: Tue May 27, 2014 8:24 pm |
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Joined: Tue May 27, 2014 7:01 pm
Posts: 2
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I'll add that I discovered this because I noticed that it took autogkintegrate more than an order of magnitude longer to perform integration than the GNU GSL procedure gsl_integration_qag, and I was looking for the cause. I think the high number of evaluations is the culprit.
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