For Loop. My goal is for my code to recognize if the user inputs an empty 'grade' and then to loop back into itself until the user enters 10 grade values individually.

[NAVNEET NAYAN]

Your code is working well. What I think is you pressed enter after the display of statement Enter the grade on the test:, that's why this error appeared. Simply give any numer and then press enter, you will see your code working.

[Owen Jansen]

I want the code to recoginze if this happens, and instead of throwing an error, it loops back and tells the user to enter the grade value again... /reject the blank input

[NAVNEET NAYAN]

Blank input means 0 or without input?

[Owen Jansen]

*without input

[Owen Jansen]

line 11 is i think what is tripping the program up

[Rik]

The error occurs at line 10, so line 11 can't be the issue yet.

[NAVNEET NAYAN]

Remove the indices (i) from 10th, 11th and 12th line and check whether it works or not?

[Owen Jansen]

It does, but then it doesn't fill the matrix. Each loop will overwrite the last with the most recent grade input.

[Rik]

Did you see my answer below? Did you try to implement it?

Answer 1

[Rik]

I would suggest using a cell array initially, which you can convert to a normal array after the loop. That way you can use the isempty function to check for an empty input.

Since you don't know how often you need to retry, I would suggest a while loop.