belisarius
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 Dec 22 comment Trace two DateListPlots? What do you mean by "trace"? Dec 22 comment Is there a LogBeta function like the LogGamma? @becko I haven't thought about that. The question is about the complete beta (I guess). Let me see, but it seems a different problem. Dec 22 comment Is there a LogBeta function like the LogGamma? @OleksandrR. Done, but not sure if it's constructive. In any case logbeta[] is now available when googling the site :) Dec 22 comment How to select a list from a list? @minthao_2011 Select[lst, (9 == Length[Union @@ #] && Times @@ (Union @@ #) != 0 &)] Dec 22 answered Is there a LogBeta function like the LogGamma? Dec 22 comment Sum over multiple indices @QuantumDot Certainly not. Dec 22 comment Sum over multiple indices @Eleven-Eleven Just define sum[n_, k_] := Sum[whatever[i, k], {i, idxs[n, k]}]and keep the definitions of my last snippet Dec 22 comment Is there a LogBeta function like the LogGamma? Beta[a,b]==Gamma[a] Gamma[b]/Gamma[a+b] So logBeta[a_, b_]:= LogGamma[a] + LogGamma[b] - LogGamma[a+b] Dec 22 comment Sum over multiple indices @QuantumDot Not sure, but may be because of the ReplaceAll Dec 22 revised Sum over multiple indices added 526 characters in body Dec 22 revised Sum over multiple indices rolled back to a previous revision Dec 22 revised Sum over multiple indices added 542 characters in body Dec 21 comment Sum over multiple indices @QuantumDot yup, editing, thanks Dec 21 revised Sum over multiple indices deleted 893 characters in body Dec 21 comment Sum over multiple indices @Eleven-Eleven Give me a few minutes Dec 21 revised Sum over multiple indices added 486 characters in body Dec 21 comment How to select a list from a list? @minthao_2011 You're welcome. Please edit your question to make it easier to understand for future readers Dec 21 comment Random Variate from a transformed Distribution Please, when you see good questions and answers, vote them up by clicking the gray triangles, because the credibility of the system is based on the reputation gained by users sharing their knowledge. Also, please remember to accept the answer, if any, that solves your problem, by clicking the checkmark sign! Dec 21 comment Random Variate from a transformed Distribution @Jim Sorry, I don't understand what you mean by "w is distributed by 3" Dec 21 answered Sum over multiple indices