How to stop a script if conditions are met.

Question

Cory 2012-2-2

1
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https://ww2.mathworks.cn/matlabcentral/answers/27774-how-to-stop-a-script-if-conditions-are-met

移动：Voss 2024-6-25，17:02

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 2021-1-6

Hi Cory, have you solved this problem? I think I encountered the same problem...

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Answer 1

Walter Roberson 2012-2-2

16
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https://ww2.mathworks.cn/matlabcentral/answers/27774-how-to-stop-a-script-if-conditions-are-met#answer_36040

编辑：MathWorks Support Team 2018-11-9

在 MATLAB Online 中打开

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 2022-10-29

在 MATLAB Online 中打开

@Walter Roberson Sir

If i have multiple conditions and i want to run get each condition according to my requirement, then can I use if and else if condition please?

if  rcp(i,m)<0.1 & trcp(i,m) > 0.8;
    ECP{i,m}=Ecp{i,m};
elseif  recp(i,m)<0.1 & trecp(i,m) > 0.8;
    ECN{i,m}= Ecn{i,m};
elseif recnn(i,m)<0.1 & trecnn(i,m) > 0.8;
    ECNN{i,m}=   Ecnn{i,m};
elseif recl(i,m)<0.1 & trecl(i,m) > 0.8;
    ECL{i,m}= Ecl{i,m};
elseif recs(i,m)<0.1 & trecs(i,m) > 0.8;
    ECS{i,m}= Ecs{i,m};
elseif recpp(i,m)<0.1 & trecpp(i,m) > 0.8;
    ECPP{i,m}= Ecpp{i,m};
elseif recm(i,m)<0.1 & trecm(i,m) > 0.8;
    ECM{i,m}= Ecm{i,m};
elseif recy(i,m)<0.1 & trecy(i,m) > 0.8;
    ECY{i,m}= Ecy{i,m};
elseif recmm(i,m)<0.1 & trecmm(i,m) > 0.8;
    ECMM{i,m}= Ecmm{i,m};
    break, 
end

There are 9 variables inside my for loop and I want to execute my variables according to certian value which I used in if conditions. Whether for loop will continue to run till all my conditions become fulfill or just break when my first condition rcp(i,m)<0.1 & trcp(i,m) > 0.8 will be met sir?

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 2022-11-5

在 MATLAB Online 中打开

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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Answer 2

Hamid Ramezani 2019-9-30

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you may use "error" function instead of return

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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 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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Answer 3

Korosh Agha Mohammad Ghasemi 2024-6-25，16:48

0
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https://ww2.mathworks.cn/matlabcentral/answers/27774-how-to-stop-a-script-if-conditions-are-met#answer_1476826

移动：Voss 2024-6-25，17:02

在 MATLAB Online 中打开

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:

Request User Input: Use input to get the user input as a string.
Check the Length: Use length to check if the input length is not equal to 5.
Return Function: Use return to exit the script if the condition is met, and display a message using fprintf.