Trajectories of eigenvalues

Program that plots the changing eigenvalues obtained progressively adding a matrix B to a matrix M.

(The comments in the program are in italian, I'm sorry.)

The program 'perteig' takes as input a matrix M, a perturbation matrix B and an integer T.
T define the accuracy of the final plot.
M is the matrix we begin with. The program computes M+tB with t=n/T (n=0,1,2,...,T) and plot at each step the eigenvalues of this matrix on the complex plane.
So, finally we can see how the eingenvalues of M move on the complex plane when we're adding B to M.

In order to do some random explorations, the function 'randevoeig(n,kA,kB,T)' define two random complex integer matrices A and B (with coefficients of size at most kA and kB respectivel), and writes them in files .csv; then, it runs perteig(A,B,T).