How to stop a script if conditions are met.

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Cory
Cory 2012-2-2
移动：Voss 2024-6-25
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.
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Jingyang Xie
Jingyang Xie 2021-1-6
Hi Cory, have you solved this problem? I think I encountered the same problem...

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采纳的回答

Walter Roberson
Walter Roberson 2012-2-2
编辑：MathWorks Support Team 2018-11-9
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
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Muhammad Usman Saleem
Muhammad Usman Saleem 2022-11-5
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 2022-11-5
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

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更多回答（2 个）

Hamid Ramezani
Hamid Ramezani 2019-9-30
you may use "error" function instead of return
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Adam K
Adam K 2020-12-10
编辑：Adam K 2020-12-10
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 2020-12-10
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.

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Korosh Agha Mohammad Ghasemi
移动：Voss 2024-6-25
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.

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