# All Questions

1k views

### Op-art Graphic Images

This image comes from Michael Trott's Mathematica Guidebook for Programming. It's just a chapter image though, and he doesn't show the code. I was wondering what would be the best approach to ...
228 views

### Is there a way to get AbsoluteTime to correctly report absolute time differences?

Absolute time supposedly reports the "total number of seconds" between two dates, but it does not. For example because of the leap second applied at 2012-06-30T23:59:60Z ...
254 views

### Parallel PowerMod

Is there anyway to parallelize the PowerMod function? Here is my Left-To-Right modular exponentation: ...
675 views

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### “Hiding” cells until the first cell is evaluated

This question is based on my earlier question about randomizing labs for students in my computer lab courses. There a perfectly good solution was posted; however, because of privilege problems, I ...
581 views

### Forget past outputs to free memory

While tinkering with a notebook that loads a large chunk of data in memory, I noticed that if I run it multiple times, the past chunks reside in memory. I understand that the reason (or one of) for ...
573 views

### Sparse convolution of sparse arrays

The documentation for ListConvolve mentions that "ListConvolve works with sparse arrays", which is true. The result, however is never sparse, eg: ...