how to create an array for each element of array

I have to create an array for each element of array. In 1st loop I have to create a array variable in 2nd loop values are stored in that array. But 1st array variables are need to be generate randomly.

l= any random number for i= 1:l node(i) for j = 1:l if(AdjMat(1,j)==1) node(i(a))=j; a=a+1; end end end end