Assigning class labels to a concatenated matrix

So I have to process certain images using a function which is custom defined.

So say I have images h.jpg , e.jpg, l.jpg

I process these by a function and each images gives me an output of 10x6

I concatenate these three vertically and its forms a 30x6 matrix say Jumbo Matrix

Now need a way to remember what is the character class for each row in this matrix. Does anyone know how to do this? Is it possible to use another array with the same number of rows as Jumbo Matrix and where in each row I can keep the corresponding class label, ie 1 for ‘h’, 2 for ‘e’, 3 for ‘l’?

Answer 1

[Walter Roberson]

Sure.

JumboClass = {'h'; 'e'; 'l'};

Then

JumboClass{3}

would be 'l'