That still doesn't address the ambiguity of your second example:

matrix_div([[[1,10],[4,4]],[[3,5],[12,2]]], [[1,4],[5,2]], 1) should return [[1,4], [2,1]]

Per the description:

$c_{1,0} = (a_{1,0}*b_{0,1}, a_{1,1}*b_{1,1} )$

Thus,

\begin{aligned}
(3,5)   &= (5*b_{0,1},2*b_{1,1}) \\
b_{0,1} &= \left\lfloor 3 \over 5 \right\rfloor \text{(integer division)} \\
b_{0,1} &= 0 \\
0 &\ne 1
\end{aligned} 

Thank. I think the kata is a 6 kyu largely because the input matrices are square, and although this fact somehow slipped out of the description after many edits, and also makes the kata not entirely satisfactory, I would still like the translations of the kata to be the same in this regard

Done

You should explain what n is in the description. Also, the examples should be language-agnostic, if feasible.

Yes, thanks. Minimal explanations are often more effective but im kinda nerd🤓

Hi Homogen,

You have a very nice idea here, but I think the description can be simplified to make it clearer.

Something like this:

The usual definition of matrix multiplication does not allow for division of matrices to be defined. In this kata we redefine matrix multiplication so that division of matrices can be unambiguously defined.
Given two square matrices of size n called A and B, define their product C by

c_{ij} = (a_{i0}*b_{0j}, a_{i1}*b_{1j}, ..., a_{ik}*b_{kj})

Example:

      A        B           		C
    |1 2| × |1 4| 	= 	|(1,10) (4,4)|
    |3 1|   |5 2|   		|(3,5) (12,2)|

The order of the product matters:

      B        A           		 C
    |1 4| × |1 2| 	= 	|(1,12) (2,4)|
    |5 2|   |3 1|   		|(5,2) (10,2)|

Then, given the product matrix C and one of the factors, we can recover the other factor, as long as we know whether the factor that we are given is the left one A or the right one B.

Task:

Implement a function matrix_div with 3 parameters:

result represents the product matrix C

factor represents one of the two factors (either A or B).

position is either 0 or 1: 0 means that factor is the right factor while 1 means it's the left one.

Return the other factor.

Examples:

matrix_div([[[1,10],[4,4]],[[3,5],[12,2]]], [[1,4],[5,2]], 0) 
should return [[1,2], [3,1]].

matrix_div([[[1,10],[4,4]],[[3,5],[12,2]]], [[1,4],[5,2]], 1) 
should return [[1,4], [2,1]].

Note: 1<=n<=30. All matrix elements lie between 1 and 100 inclusive. Division of elements is integer division.

haha thanks, it was very concise and clear

I apologize for my insufficient knowledge of the Codewars documentation, but I don’t understand how to take advantage of this mistake, and much less how to fix it

Python: Random tests are vulnerable to input modification

Thanks i am changed a few things

Write if you still have something to add

I think that properly used KaTeX and math markup could make description a bit clearer. The monospaced block looks weird.

;-)

I am so sorry mr Voile but i am still still waiting and i hope im not distracting you from something very important