Timeline for How can I enforce the use of Subtract and Divide?
Current License: CC BY-SA 4.0
11 events
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| Feb 15 at 16:41 | history | edited | Domen | CC BY-SA 4.0 |
added 15 characters in body; edited tags; edited title
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| S Feb 15 at 16:30 | history | suggested | codebpr | CC BY-SA 4.0 |
made grammatical and structural changes
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| Feb 15 at 15:52 | review | Suggested edits | |||
| S Feb 15 at 16:30 | |||||
| Feb 15 at 15:46 | answer | added | Glenn Welch | timeline score: 1 | |
| Feb 15 at 14:34 | answer | added | Roland F | timeline score: 2 | |
| Feb 15 at 1:28 | comment | added | Goofy |
"possible to convert to Cos[Divide[x,y]]?" -- That's what I mean in (2). In (3): A system function computes a value for you. How can you keep the function from using x * y^-1. For example, a symbolically computed jacobian in FindRoot or other function.
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| Feb 15 at 0:50 | comment | added | Felipe | @Goofy What do you mean by (3)? If I generate a Cos[x/y] through some derivative it is not possible to convert to Cos[Divide[x,y]]? Convert using code, of course. | |
| Feb 14 at 16:53 | comment | added | Goofy |
(1) Any code evaluated symbolically before numerically will convert Subtract and Divide. So you have to avoid that. Somehow. (2) You could post-process generated code, making sure it was held (not evaluated) until numeric inputs are in place. (3) Subtractions and divisions within internal functions are probably unreachable. (4) Internal functions evaluated on numeric input sometimes perform different computations than what would be done by the expression returned when evaluated on symbolic input. (E.g. Eigenvalues.) Tricky to optimize in such a case.
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| Feb 14 at 16:35 | comment | added | Felipe | I work with a variety of input functions and some of them depend on special functions, which don't compile. | |
| Feb 14 at 16:33 | comment | added | Domen |
Why don't you compile your code? Certainly, this will much more improve the performance than only converting things to Subtract and Divide.
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| Feb 14 at 16:25 | history | asked | Felipe | CC BY-SA 4.0 |