Looking for a to code the Hadamard product without using a library. Still relatively new to Elixir so feeling a bit lost.

[image] Trevorton27: Hadamard product For the non mathematicians like me, here’s the wikipedia definition In mathematics , the Hadamard product (also known as the element-wise product , entrywise product [1] : ch. 5 or Schur product [2] ) is a binary operation that takes two matrices of the s…

That’s a one-liner comprehension :grinning_face:

[image] josefrichter: That’s a one-liner comprehension a very long and indecipherable one I fear :sweat_smile: (but I have issues with comprehensions’ comprehension)

I was joking of course :slight_smile: But was pointing towards some sort of multiplying two 1D lists

:smile: yup! I just had a kind of Lovecraftian vision for that multi-dimensional one-liner .. :wink:

What is the data structure for your matrices?

Thank you for asking. Here are some test cases: Test.test([1, 2], [3, 4]) => [3, 8] Test.test([[1, [[2]]]], [[3, [[4]]]]) => [[3, [[8]]]] Test.text([[1, 2]], [3, 4]) => raise custom error

I don’t know much about math but it looks like your matrices can have any level of “nesting”, and are “irregular” (some are row>col>sub, other cols are just numbers, some rows are numbers without cols) but your valid cases always imply that the two matrices have the same shape, they are symmetrical. …

I would suggest using functions. A 2D matrix is a function of two arguments. You could define the Hadamard product of A, B as: H(i, j) = A(i, j) * B(i, j) That is readable. Representing matrices as arrays is done for efficiency of computation. If you need efficiency then use the Nx library. A pr…

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Hadamard product without using a library?

Questions & Help Questions

hauleth February 10, 2022, 11:39am 4

Enum.zip_with(a, b, &*/2), but this will work only on 1D lists.