Dynamically determining a matrix

I have a some data, say n rows and 4 columns. I can easily form a state matrix as indicated below.

A = [a b c d; b e f g; c f l k; d f l n];

Note: Each element in A is scalar and was computed from the data.

How can I generalize it so that it can accommodate any number of columns?

[James Tursa]

Please show what the upstream calculations are for producing the scalars that will go into the matrix. Then we can advise how to get them into a matrix in a generalized way.