[ruby-core:83836] [Ruby trunk Feature#14116] Add Matrix #exponentiate method as Matlab's exp

Issue #14116 has been updated by greggzst (Grzegorz Jakubiak).


marcandre (Marc-Andre Lafortune) wrote:
> Thanks for the PR.
> 
> The name is not acceptable, as the exponential of a matrix is something different (expm in Matlab): https://en.wikipedia.org/wiki/Matrix_exponential
> 
> I wish I was more familiar with machine learning to know how frequent calculating this is. If it is, there should be a name for this, no?
> 
> The fact that `map{|e| Math.exp(e)}` is quite simple to do makes me even more hesitant to add that method too.

I changed the name to entrywise_exp as suggested. True about the simplicity but it would be a good shorthand taking into consideration fact that it is used many cases e.g. multivariate normal distribution.



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Feature #14116: Add Matrix #exponentiate method as Matlab's exp
https://bugs.ruby-lang.org/issues/14116#change-67868

* Author: greggzst (Grzegorz Jakubiak)
* Status: Feedback
* Priority: Normal
* Assignee: marcandre (Marc-Andre Lafortune)
* Target version: 
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Add exponentiate method which results in returning a new matrix with each element being an exponent of the number e.
Here is PR for that: https://github.com/ruby/ruby/pull/1762



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