Question: How to make animation of matrix plotting ?

How to make the matrix construction by points animated?
I sketched this code - it doesn't work(((
 

a := Matrix([stoimostyM, izmeniya]);
plots[animate](plot, [a[n, m]], n = 1 .. 2970, m = 1 .. 2, numpoints = 50, frames = 100);
Error, bad index into Matrix
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