Clojurians Log v2

is there a way to fill in a submatrix with a value?

I can easily fetch a submatrix but can't find the right function to generate a new matrix with submatrix filled with the value I want

Some implementations support mutable submatrices

e.g. with vectorz-clj

(let [m (new-array :vectorz [3 3])] (fill! (submatrix m [[1 2] [1 2]]) 7) m) #vectorz/matrix [[0.0,0.0,0.0], [0.0,7.0,7.0], [0.0,7.0,7.0]]

That's probably the most efficient. Otherwise you can use set-selection e.g.

(let [m (new-array :vectorz [3 3])] (set-selection m [1 2] [1 2] 7)) #vectorz/matrix [[0.0,0.0,0.0], [0.0,7.0,7.0], [0.0,7.0,7.0]]

seems to work in the same way also without the :vectorz @mikera

is that the default maybe?

set-selection should be fine with any implementation

The fill! method requires a mutable implementation

set-selection would be good but it only returns the submatrix changed

not a whole new matrix with the content changed

Hmmm it should return the whole new matrix

You have a simple example?

ah no sorry my bad

yeah that seems perfect

Cool glad it works for you!

I've been meaning to get something like specter working with core.matrix, this would be a more general tool that would be very useful for examples like this

i may have asked this before but is there a way to get the vector of indices of the max element of a matrix ?