MATLAB: Taking the first element of each matrix

Question

Hi all,

I have 128 1×5000 and 128 1×10000 matrices. I want to take the first element of each matrix and write it down to a new output file with the matrix name next to it.

For instance,

A=[1,2,6……] B=[2,2,4,8,…] . . . Z=[3,8,9……]

Output=[A,1;B,2;….;Z,3]

Many thanks !

Answer 1

A=[1 2 3]
B=[2 3 4]
out={sprintf('A%d',A(1)), sprintf('B%d',B(1))}