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6h
revised Different colors for nodes in tree plot
edited title
6h
revised Undocumented form for Extract
edited title
6h
revised Why does Arrow not work well with Scaled coordinates in 3D?
edited tags
1d
revised Determining the dimension of a probability distribution
added 164 characters in body
1d
comment Determining the dimension of a probability distribution
@Andy I think you're in a much better position to answer this ... Is DistributionDomain robust? It's not documented but it is in the System context.
1d
revised Determining the dimension of a probability distribution
added 126 characters in body
1d
revised Determining the dimension of a probability distribution
added 126 characters in body
1d
comment Determining the dimension of a probability distribution
I've never used this function before, I found it using some spelunking when I saw your question.
1d
answered Determining the dimension of a probability distribution
1d
comment Mathematica function Det has unexpected behavior
Please put all code in a code block, otherwise it is unreadable and people are not going to look at the problem. Formatting help is on the right of the edit box.
1d
comment Can ParallelDo speed up a counting problem?
For parallelization, the first thing to do is to try to formulate the problem in terms of functions with no side effects. That rules out using = on any global variable. So think about whether you can use ParallelTable instead (what Oleksandr said). Before trying to parallelize, also consider vectorization, i.e. doing arithmetic on arrays of numbers in one go. Many array operations are internally parallelized already.
1d
comment How to compute variances from a matrix/table
If your data is stored in data, what does Dimensions[data] say?
2d
awarded  Nice Question
2d
comment Scan vs Map vs Apply
Do not define f when you do this, then it'll be much easier to understand what's going on. ...^2 threads over lists so your results don't reflect only the effect of Map, etc. but also this auto-threading. Take a look here and in the documentation page of each function. There are plenty of examples. For example the documentation clearly explains that Scan is the same as Map except it doesn't return anything. If is useful when f has a side-effect, e.g. f=Print.
2d
answered How would I enable the Evaluate in place item of the Evaluate menu?
2d
comment Mathematica9: NDSolve slows down after repeated calls
@user13754 This is not an official Wolfram site. We are just users like you. If this bug affects you then the best thing you can do is contact Wolfram support and complain about it, which I guess might help prioritize this problem.
Apr
15
comment How can I make my MM code more compact and readable? Can I put functions in different notebooks?
Everything from the last section header up to the end of the document is part of the last section. Make a new section for your new cells.
Apr
15
comment How can I make my MM code more compact and readable? Can I put functions in different notebooks?
Place the cursor not in a cell, but inbetween two cells. Then press Alt-4 which created a section header cell. Type the name of the section. Now everything below this section header will belong to the section (up to the next header) and can be collapsed by double clicking the corresponding cell bracket (vertical blue line on the right).
Apr
15
comment How can I make my MM code more compact and readable? Can I put functions in different notebooks?
Use sections (Alt-4, Alt-5, etc.) in the notebook to structure it, then fold them so they're invisible. If you have lots of functions that you don't change much, use packages.
Apr
15
comment Why isn't Mathematica plotting my differential equations?
That's because the solution contains non-numerical parameters. A simpler example: you can't plot a*x^2 in terms of x without giving a a valuer first.