String Concatenation in Matlab

This video shows how to attach numbers to strings, that is, how to accomplish number to string concatenation.
 

the matrix X into a string representation T with about 4 digits and an exponent if required. This is useful for labeling plots with the TITLE, XLABEL, YLABEL, and TEXT commands. 

It means that you then get a string version of the number and can concatenate it to other strings in a logic sequence. A string is a row vector of characters and you can put them inside a pair of brackets. This technique is not recommended to create variables like a1, a2, a3... in that case it’s better to use some type of indexing, like a(1), a(2)... or, in general a(i), where i is a positive integer.