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failing evaluation under vectorize()
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Why does the vectorize operation fail while it seems to be safe to use an explicit loop?  6-2-Bug.sm (28kb) downloaded 7 time(s).![2023-11-21 18_18_50-SMath Solver - [6-2-Bug.sm_].png](/forum/resource.ashx?a=48495&b=2) |
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Originally Posted by: mkraska  Why does the vectorize operation fail while it seems to be safe to use an explicit loop? Hi Martin. Because you have just only one function which can't be vectorized: the norme or dot product of vectors.  Best regards. Alvaro
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on 22/11/2023(UTC), on 22/11/2023(UTC), on 22/11/2023(UTC)
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Is that just by observation or is there a fundamental obstacle?
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Originally Posted by: mkraska Is that just by observation or is there a fundamental obstacle? Hi. I guess that it is fundamental. Some notes about how other CAS handle this issue. Pretty old matlab version, from its symbolic toolbox  The help page from the newest version  So, it looks like they have some issues with automatic vectorization. With maple it is very uncomfortable, you need to use map even for simple cases  Wolfram's solution is very practical: Function with attribute 'Listable' expands over lists  But for make a table you actually need a loop or the Mathematica's Map function. Best regards. Alvaro.
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on 24/11/2023(UTC), on 26/11/2023(UTC)
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Originally Posted by: mkraska Why does the vectorize operation fail while it seems to be safe to use an explicit loop ? Set the demand in local definition mode ... new(t):=|a(t) vectorize and equate
6-2-Bug Doctored.sm (30kb) downloaded 3 time(s).
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1 user thanked Jean Giraud for this useful post.
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Thanks Alvaro and Jean. Here is a reduced working example. When a scalar function involves scalar products then it must be defined in a line()-block in order to be vectorize()able.  Worksheet13.sm (6kb) downloaded 5 time(s). |
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failing evaluation under vectorize()
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