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awarded  Custodian
1d
reviewed Leave Open RSolve fails on a two equation linear system
1d
comment Can I hold a condition in NMaximize/NMinimize?
Can you maybe give a tiny example? Also maybe try SetAttributes[psQ, HoldAll]; psQ[m_] := PositiveSemidefiniteMatrixQ[m];
Apr
29
comment Importing an .eps file failed in the latest version of mathematica
I would contact Wolfram Technical Support with a copy of the file that isn't working.
Apr
29
comment Importing an .eps file failed in the latest version of mathematica
It's really hard to tell what might be going on. Can you open the file with another program? Esp. can you open with it Ghostscript/GhostView?
Apr
26
comment How to find this probability with PDF from TransformedDistribution?
Huh. I assumed Integrate would have found that when I wrote it out. I wonder if I did something wrong or if Integrate didn't find it.
Apr
26
comment How to find this probability with PDF from TransformedDistribution?
There's no reason to believe there's a solution to this problem. You may have to use an approximation instead.
Apr
26
comment How to find this probability with PDF from TransformedDistribution?
Have you tried writing the integral yet? Are you familiar without how to do that? Use PDF to get the PDF of the Rice Distribution. Integrate[( 2 E^(-((t^2 + v^2)/[Alpha])) t BesselI[0, (2 t v)/[Alpha]])/[Alpha] t^2, {t, 0, m}]
Apr
25
awarded  Nice Answer
Apr
22
comment Fitting Stradivari's scroll
Yes. You could write a function that goes through a list and when it sees a value drop by 2Pi adds 2Pi to all subsequent values.
Apr
22
answered Fitting Stradivari's scroll
Apr
22
comment Multiply integrand with -1, and the precision changes?
No. Doesn't sound silly to me. (1) NIntegrate does some symbolic pre-processing and anything you do you might affect that. That is reason enough to not find this surprising. If you haven't already, try ("SymbolicProcessing"->0). (2) And are you absolutely sure that changing the sign wouldn't significantly affect the evaluation for the numerical method you chose? That isn't obvious to me either. (reference.wolfram.com/language/tutorial/…)
Apr
19
reviewed Approve DiscretizeRegion does not include the boundary specified in ImplicitRegion (10.1)
Apr
19
comment Mathematica doesn't know about the absorption identity?
You didn't ask Mathematica to do anything. To begin with, try looking at the documentation for FullSimplify and Reduce.
Apr
17
comment Meaning of the character sequence after an Entity's name
I don't understand what that means. It doesn't make sense. Where is that from? My statement is all you need to know about this. There's no mystery. No secret. No magic. It's just a hash to make the string unique.
Apr
17
comment Meaning of the character sequence after an Entity's name
No. It doesn't mean anything. It's just a hash of something from somewhere to ensure that the value is unique. It can also change basically without warning.
Apr
15
comment How to calculate accurate answer in Mathematica?
That is called floating point error. Don't avoid it. You need to understand why it exists. If you want to get the answer that Wolfram|Alpha gives, use Rational numbers. Instead of using (0.5), use (1/2).
Apr
11
comment Performance of Apart with complex numbers
@vhst If you file this as a bug, you'll probably get that reaction you fear. If you write this as a suggestion they will forward it to the developers.
Apr
11
comment Performance of Apart with complex numbers
@vhst I would forward any suggestions you have like this to support@wolfram.com and let them know it's a suggestion on how to improve Apart.
Apr
11
comment Performance of Apart with complex numbers
@vhst Fine for you and other smart people. There are a huge majority using Apart that would find legacy code running more slowly and wouldn't understand.