Using loops to perform vector functions

I'm new to MATLAB and I'm having trouble with my function. I'm trying to call upon a different operation "op" to do subtraction instead of addition but despite entering op as 2 it's still doing addition. Any help is greatly appreciated.

[Torsten]

Maybe a2 = 0 ?

[Jonathan Lam]

I set a2=[4 5 6 ] and the function worlks for addition. I'm not sure why subtraction isn't working.

[Torsten]

You set op=1 within the function.

Answer 1

[Rik]

There is an mlint warning on line 7. If you hover your mouse over it, you will see a message that this input is not being used.

If you remove line 10, the op input will be used, and the code should work as expected.

[Jonathan Lam]

Thank you so much, one line of code can drive someone crazy!

[Rik]

It is a good habit to always make sure there are no mlint warnings. If you are 100% sure the warning isn't a problem, you rightclick to add %#ok with a specific flag. This will hide that specific warning on that specific line. That way you can easily see if you made another mistake on the same line.

The added benifit of doing it that way: if the reason for the mlint warning disappears, you get a new warning. So if you make a mistake, that will still show up.

Answer 2

[KSSV]

In the function you have given input op which decides wheter to add ot subtract. But you are over writitng the input op inside the code to op = 1. So always the function adds. You need to remove the line op = 1 i.e. ine number 10 in the code.

Also your variable result has to be intiailized before the loop.

[Jonathan Lam]

Great catch, thank you so much!