exist function terminates script

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John Knowles 2016-6-29

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https://ww2.mathworks.cn/matlabcentral/answers/293023-exist-function-terminates-script

编辑： Stephen23 2017-1-7

After an if-exist block, why does script stop executing? In example below the code never gets to the final line. I feel that regardless of the state of the if block, the final line should execute. If I comment out the if and end lines, then I do get to the final line.

    IniParamFlag=1;
    if exist('Params','var')==1,
        IniParamFlag=menu('Initialize parameters','yes','no');
    end
    IniParamFlag

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John Knowles 2016-6-30

Interesting. What version are you using? I'm on MATLAB Version: 8.6.0.267246 (R2015b). I find that if the condition evaluates to '1', then the code inside the if/end is executed, but nothing after the end. If instead it evaluates to zero, then nothing further is executed.

Adam 2016-6-30

R2016a

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采纳的回答

Walter Roberson 2016-6-29

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https://ww2.mathworks.cn/matlabcentral/answers/293023-exist-function-terminates-script#answer_227174

You appear to have a control-Z immediately after your 'end' as the very next character.

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John Knowles 2017-1-7

编辑：John Knowles 2017-1-7

Thank you Walter and Image Analyst for taking the time to explain this. I somehow missed your last replies until now, when I got hit with a new instance of the problem. You were exactly right and the problem is now solved.

Stephen23 2017-1-7

编辑：Stephen23 2017-1-7

This is a good example of where Notepad++ is an extremely handy text editor to have around: the menu View -> Show Symbol has a number of options, and makes finding bugs like this one easy.

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