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Mar
24
reviewed Approve suggested edit on How can I separate two parts of power of Exponential functions?
Mar
24
comment Maintaining postfix convention for directives in notebooks
Postfix is a typesetting function and not the same as // in functionality
Mar
23
comment Why can I edit only one character of the output of a Dynamic expression?
Thanks for writing it down. I was reasonably confident in my guess that it was only the place holder that was deceiving you, but large parts of dynamic functionality are still mysterious to me... I've been burned by other similar guesses I've made before, so I didn't feel like posting an answer :)
Mar
23
comment how to load packages on local computer when using remote kernels
That was a fast response! :D :D In any case, bitbucket also allows mercurial repos, so you should be fine. I think bitbucket (private repo + ssh keys) should be the best option for you.
Mar
22
comment Plotting power spectral density from transfer function
Please do not post the same question on multiple sites (this is to avoid duplicated efforts). If you're doing this in Mathematica, please include the relevant code.
Mar
22
comment Monitor progress of a ParallelMap computation
Possible duplicate: mathematica.stackexchange.com/q/1548/5
Mar
22
comment Eigenvector Anomaly
@RahulNarain Thanks! It's now open :)
Mar
22
comment Eigenvector Anomaly
@MarkAdler Oh, I fully agree with that. It was just that the crowd that uses W|A exclusively for all kinds of purposes (from random Facebook graphs to baking measurements to the speed of an unladen swallow to homework assignments...) is generally not interested in learning Mathematica and they're not the crowd that we want to invite and encourage on this site :) The rule is primarily to raise the barrier of entry to this site... this is how the average ("good") W|A question looks like :D
Mar
22
comment Eigenvector Anomaly
@RahulNarain Since this behaviour is also displayed in Mathematica, feel free to replace them with the equivalent commands (preferably, using Eigenvectors instead of WolframAlpha) and throw in a vote to reopen. I'll chip in my vote as well if you do so :)
Mar
22
comment Eigenvector Anomaly
@MarkAdler One might call the rule a bit too hasty/premature, but it has worked well and no one has dissented thus far. You're certainly welcome to write an answer on meta if you strongly feel otherwise :) I'm aware that one can use the WolframAlpha function in Mathematica. I also addressed this in my answer — using W|A from inside M is fine as long as it is not trivial and designed just to work around this off-topic restriction.
Mar
22
comment Eigenvector Anomaly
@MarkAdler I understand what you mean, but this was discussed a couple of years ago and the community agreed that such questions were off-topic (disclosure: I wrote the opinion there) and it's even in the official FAQ. When I wrote that, the site was just a month old, but in the 2 years since, there have been several questions on W|A which were marked off-topic by users... this is actually the one rule that has been applied consistently! (continued...)
Mar
21
comment Eigenvector Anomaly
@MarkAdler Did you follow the "query" links? :)
Mar
21
comment Eigenvector Anomaly
1) We do not discuss Wolfram|Alpha questions/issues here. They're explicitly off-topic. 2) The bugs should be used only if the behaviour has been confirmed by the community as anomalous and a bug.
Mar
21
comment What is the fastest way to obtain the eigenvalues of a Wishart matrix?
Because it is implemented more generally than what you've done here. You can use a non-diagonal Sigma and it uses MultinormalDistribution to generate the data. In any case, the core part of it is implemented the same way as yours, so I don't see a reason to look for a different way. It's probably as efficient as it can be.
Mar
21
comment What is the fastest way to obtain the eigenvalues of a Wishart matrix?
What you have looks pretty good to me (this is how I've done it). The alternate that I know of is "cleaner", but very slow — Needs["MultivariateStatistics`"]; eigs = Eigenvalues@RandomReal[WishartDistribution[σ IdentityMatrix@n, m]] You might want to define your functions with :=... see here for the difference between = and :=
Mar
21
revised What is the fastest way to obtain the eigenvalues of a Wishart matrix?
deleted 155 characters in body
Mar
21
answered Efficient method for Inserting arrays into arrays
Mar
21
comment Efficient method for Inserting arrays into arrays
@VF1 a and b both have the same number of column elements... but yes, it would be better to be explicit whether the insertion is by row or column (esp. with square matrices)
Mar
21
comment What is the fastest way to obtain the eigenvalues of a Wishart matrix?
Do you have a slow method now? Wishart matrices are trivial to construct and Eigenvalues on 100x100 machine number matrices should be very fast as well...
Mar
21
reviewed Approve suggested edit on Entering scientific notation in an InputField