Timeline for Perform matrix/tensor contractions more efficiently
Current License: CC BY-SA 3.0
7 events
| when toggle format | what | by | license | comment | |
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| Apr 1, 2016 at 9:40 | history | tweeted | twitter.com/StackMma/status/715836193976545284 | ||
| Mar 31, 2016 at 14:38 | answer | added | jose | timeline score: 8 | |
| Mar 30, 2016 at 22:58 | comment | added | J. M.'s missing motivation♦ |
You've seen MatrixPower[], right?
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| Mar 30, 2016 at 22:27 | comment | added | Michael Weyrauch | The important fact you have to know is that Dot[] always contracts the last index of one tensor into the first of another. Therefore, you just need to Transpose or Flatten appropriately and then use Dot. As @march said this will always work and you can do the most complicated contractions. | |
| Mar 30, 2016 at 21:29 | answer | added | yarchik | timeline score: 5 | |
| Mar 30, 2016 at 21:12 | comment | added | march |
Are you absolutely certain that they can't be done using Dot (which is more general than just matrix multiplication), Transpose, Flatten, and Tr? I'm willing to bet that it can be done with those optimized built-ins. Also, at least, please provide an example of one that can't be done with matrix multiplication and Tr for us to play with.
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| Mar 30, 2016 at 21:06 | history | asked | Stan | CC BY-SA 3.0 |