Homework help.(User defined functions )

Can anyone help me figure out this homework.

function [add,sub] = Add_Subtract (M1,M2)
               add = M1 + M2 ;
              sub = M1 - M2 ; 
end

This is what's requierd in the homework (Write a MATLAB User defined function code to calculate both the subtraction and addition of 2 matrices (it should check the dimensions of both matrices and return dimensions error if the dimensions does not match)

I know how to write the function and this is what I've done so far

But what i can't understand is how to make the function check the dimensions of both matrices and return dimensions error if the dimensions do not match

Answer 1

[James Tursa]

Hint: See these functions:

doc size
doc isequal
doc error

[Ahmad Farghaly]

can you please show me how to use them sorry this is my first week learning matlab and i don't know a whole lot yet