How to stop a script if conditions are met.

1,801 views (last 30 days)
I am using the 'if' function to detect if a user inputs a number that is not 5 digits long. What I would like is a function that stops the script if a certain condition is met without displaying an error message.
P.S. I'm very new to MATLAB.
  1 Comment
Jingyang Xie
Jingyang Xie on 6 Jan 2021
Hi Cory, have you solved this problem? I think I encountered the same problem...

Sign in to comment.

Accepted Answer

Walter Roberson
Walter Roberson on 2 Feb 2012
Edited: MathWorks Support Team on 9 Nov 2018
To stop running a script or function and return to the invoking function or command window, use the return function. For example,
if a > b
return
end
Any code in the current script or function that is after the return function is not run
  9 Comments
Muhammad Usman Saleem
Muhammad Usman Saleem on 5 Nov 2022
Respected Sir @Walter Roberson, I not get the point your shared. Will you please amend this suggestion in my code shared above please?
Walter Roberson
Walter Roberson on 5 Nov 2022
notdone = true(9,1);
while any(notdone)
if rcp(i,m)<0.1 & trcp(i,m) > 0.8
ECP{i,m}=Ecp{i,m};
notdone(1) = false;
end
if recp(i,m)<0.1 & trecp(i,m) > 0.8
ECN{i,m}= Ecn{i,m};
notdone(2)=false;
end
%etc
end

Sign in to comment.

More Answers (2)

Hamid Ramezani
Hamid Ramezani on 30 Sep 2019
you may use "error" function instead of return
  3 Comments
Adam K
Adam K on 10 Dec 2020
Edited: Adam K on 10 Dec 2020
I think a 'msgbox' to really alert the user what is the issue, and then the 'error' funcition to stop the code would be a workaround. This way the user is aware that the issue is not really an 'error' when they see the red error font.
msg = "You've got a number that is not 5 digits long";
f = msgbox(msg)
error(msg)
Rik
Rik on 10 Dec 2020
I wonder if it is possible to detect if the code is running in a try block. In such cases the message might be more confusing than simply throwing the error.

Sign in to comment.


Korosh Agha Mohammad Ghasemi
Moved: Voss on 25 Jun 2024
To stop a script in MATLAB without displaying an error message when a user inputs a number that is not 5 digits long, you can use the return function. The return function will exit the function or script without an error message. Here is an example:
% Request user input
userInput = input('Please enter a 5-digit number: ', 's');
% Check if the input is 5 digits long
if length(userInput) ~= 5
fprintf('Input must be a 5-digit number. Exiting script.\n');
return;
end
% Continue with the rest of your script
disp('Input is valid. Continuing script...');
% ... rest of your script
Explanation:
  1. Request User Input: Use input to get the user input as a string.
  2. Check the Length: Use length to check if the input length is not equal to 5.
  3. Return Function: Use return to exit the script if the condition is met, and display a message using fprintf.
This will ensure that the script stops if the user input is not a 5-digit number, and it will do so without throwing an error.

Categories

Find more on Loops and Conditional Statements in Help Center and File Exchange

Community Treasure Hunt

Find the treasures in MATLAB Central and discover how the community can help you!

Start Hunting!