Im new to Wolfram, and im a little lost. i should make module that has input for 2 matrices, returns only positive values of the first one, and makes the second lower triangular. after that i should find product of the 2 new. if the product is not possible i should print message for that. please help
Are you using Mathematica?
What kind of code have you written so far? Have you been able to make matrices in mathematica and then run these functions on them?