Please explain the star marked

IND=find(A_mat ~=0);
V_O=[]; *************************
for h=1:length(IND)
    V_O=[V_O  IND(h)*ones(1,A_mat(IND(h)))];**************

[Stephen23]

These are basic MATLAB concepts. You can learn them by doing the introductory tutorials, which are highly recommended for all beginners:

https://www.mathworks.com/help/matlab/getting-started-with-matlab.html

and by reading the find, length, and ones documentation.

[Komal Gaikwad]

thnx @Stephen cobeldick