C ++中矩阵的动态名称（Armadillo库）

Question

I want to generate k different random matrices in C++(with Armadillo library) where n is not fix at first and is an input in my function. It is easy in Armadillo to generate random matrices by using the following code within a for loop :

 mat A = randu<mat>(n,n);

But since I need them in the next steps, I have to assign dynamic names or indexes for them, eg A1, A2, ... . I want to know which method is the best one for this case except of using the pointers?

Answer 1

It might be more convenient (and efficient, but have not tested) to instead use an armadillo cube:

cube A = randu<cube>(n,n,k);

A single matrix in this cube would then be accessed as A.slice(i) with 0 ≤ i ≤ k-1. Just like matrices cubes can be resized at runtime, so you can dynamically change your n and k. You can even preserve old values using A.resize(n',n',k')