is it an array?

Ca_len = S(1,1)*S(1,2);

S is not defined anywhere. i want to know what it is. is it an array?

Answer 1

[Matt J]

Execute whos(S) in the workspace where S lives.

Answer 2

[Azzi Abdelmalek]

If S is not defined, maybe it is a function. Check it by

dir s.m

[Matt J]

Or

which S(1,1)