Break doesn't break out of endless loop

Question

Hieu Philip Hoang 2019-2-14

0
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此问题的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/444947-break-doesn-t-break-out-of-endless-loop

评论： Walter Roberson 2019-2-14

在 MATLAB Online 中打开

Hey guys!

I am designing an app, where one function is to read out some strings, which are sent from an Arduino.

So basically, the Arduino will send something like

D0.00

D0.05

D0.1

D0.15

DS

over serial. DS is the "stopper" string, so if DS is sent, the app shall stop reading over Serial.

Now, whats frustrating me, is following: My code to read out these strings is

while 1
    pause(0.001);
    %read out data from serial
    received_stringM = fgets(app.s);
    
    %DS is the stopper string, so if it is sent, the while loop should end
    if received_stringM == "DS"
        break
    end
      
    %to display the sent string in an Edit Field
    app.currentdistanceEditField_2.Value = received_stringM;
    
end

This is the Edit Field, where the string is displayed to.

But exactly this is wondering me. The code is very simple, but I thought after the break command, the following lines shouldn't be executed. But obviously, even though DS is sent, it doesn't break, but is displayed.

Does anyone see any mistake in my code?

Thanks for reading and for any advices!

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Hieu Philip Hoang 2019-2-14

Yea, just tried it out. It seems like there is some issue in comparing received_stringM and "DS" in the if line. I tried everything out you guys told me, but none of it worked, which is really weird...