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 Mar 17 accepted Recovering colour code from splitting colour scheme gradient into n colours Mar 17 asked Recovering colour code from splitting colour scheme gradient into n colours Mar 2 comment NIntegrate discrepancies Hm. It seem mysterious to me. I'll check the maths again. Thanks! Mar 2 awarded Curious Mar 2 accepted NIntegrate discrepancies Mar 1 comment NIntegrate discrepancies Thanks. Definitely improves. Can you comment on why the parameterisation yields different results? I guess I'm just curious... Mar 1 comment NIntegrate discrepancies @MichaelE2: Thanks for pointing it out. I've included an update to provide more detail as to why the parameterisation might help. Suggestions as to how to obtain symbolic answers to the complete problem would be great. I've tried "folding" the symbolic integral, but it's still not working... Mar 1 revised NIntegrate discrepancies Details Mar 1 revised NIntegrate discrepancies added 83 characters in body Mar 1 comment NIntegrate discrepancies @MarcoB: Yes, it is an X. Thanks for pointing it out. The typo does not affect the question though$-$the typo was introduced when I was renaming variables for the OP question. The output corresponds to X in the first integration range. Mar 1 revised NIntegrate discrepancies Typo Mar 1 asked NIntegrate discrepancies Mar 2 awarded Popular Question Jul 12 comment Performance of numerical optimization with triple integral Your solution is very clear and runs swiftly. Jul 12 comment Performance of numerical optimization with triple integral Thanks for this. I've changed the question again so that it is framed around the non trivial problem, and not implying directly a solution related to a change in coordinates. I'm not very experienced with the forum, so I hope this structure makes more sense to everyone (I suppose that's why it was put on hold as off topic) Jul 12 revised Performance of numerical optimization with triple integral Improved wording and phrasing of the actual question Jul 11 revised Performance of numerical optimization with triple integral added 95 characters in body Jul 11 comment Performance of numerical optimization with triple integral I've edited the question to allow for a non-trivial optimization (and have already included some of your suggestions). Any further advances to solve such a problem would be much appreciated Jul 11 revised Performance of numerical optimization with triple integral Additional information Jul 11 comment Performance of numerical optimization with triple integral If you call the function with any explicit argument, say q2[1,1] you get an error message. Do you know what that is? I think that something is going on with it, but NMaximize is not picking it up because in this simplified version of the problem there is only one feasible point...