As it has already been mentioned that the first code is function and the other one is a script.
I suppose you get the point but are wondering about the basic difference between them. To make things clearer, suppose we have a variable x in our work space say
x=10 (typing this in the console).
Suppose your function is in the file sq1.m. Code is as follows :
If you want to access it from command line, you have to type
because functions have their own local space so you need to explicitly pass argument.
On the other hand, consider your script file sq2.m with same workspace. Code is as follows:
If you want to access it from command line, you just need to type
So in simple words:
Each statement in a script is equivalent to typing them out at the command window of MATLAB. You're just storing them before-hand in a file!
A function, on the other hand, takes in arguments and is a "new" workspace, separate from the main workspace.