Timeline for How to implement Outer with loops
Current License: CC BY-SA 3.0
11 events
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| Jan 21, 2017 at 14:50 | comment | added | jkuczm |
My answer to "How to implement the general array broadcasting method from NumPy?" question contains "C" implementation of broadcasting, which "overlaps" with Outer.
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| Jan 19, 2017 at 16:20 | answer | added | LLlAMnYP | timeline score: 1 | |
| Dec 11, 2016 at 11:58 | comment | added | Simon Woods | I'm not clear on the goal here. Are you using Mathematica to prototype an algorithm which you will write in C, or are you after a CompiledFunction in Mathematica which you can use in place of Outer? | |
| Dec 11, 2016 at 10:47 | comment | added | Simon Rochester | If you're going for performance in a particular situation, I would suggest amending your question with a simple example problem for benchmarking, and maybe an algorithm to beat. People go ape for questions like that around here... | |
| Dec 11, 2016 at 9:09 | comment | added | TheGuest |
@Mr.Wizard, while it's true that in most cases vectorization is the way to go in mathematica it's by no means always the case. For example the use of loops in Compile can outperform vectorized operations, esp. when the compilation target is C. Maybe this forum is not quite the right place to ask, but in a C forum people might have a hard time to understand Outer.
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| Dec 11, 2016 at 9:07 | comment | added | TheGuest | @Sascha, I'd like to implement a Outer in C for integer packed arrays. | |
| Dec 11, 2016 at 5:41 | comment | added | Mr.Wizard |
You can build your Do-loop code using metaprogramming. However one usually wishes to go the other direction in Mathematica, i.e. convert verbose loops into concise high-level abstractions such as Outer, therefore I echo Sascha's question: why? If you explain the purpose behind this question it is likely that you will get more useful replies that if you do not.
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| Dec 11, 2016 at 2:39 | history | edited | J. M.'s missing motivation♦ |
edited tags
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| Dec 10, 2016 at 23:26 | comment | added | Sascha | Why would you like to do this? If this is a quest for better understanding you might want to skip loops altogether and if you are trying to improve performance you ought to look elsewhere since loops are not efficient in Mathematica. | |
| Dec 10, 2016 at 21:23 | review | First posts | |||
| Dec 10, 2016 at 21:41 | |||||
| Dec 10, 2016 at 21:20 | history | asked | TheGuest | CC BY-SA 3.0 |