How do I loop a program that waits for a .dat file to be updated?

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Sam Soifer 2018-11-19

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此问题的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/430838-how-do-i-loop-a-program-that-waits-for-a-dat-file-to-be-updated

评论： Luna 2018-11-20

采纳的回答： Mark Sherstan

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I am trying to loop a program that calls data from a gui input.

In this case 'steps.dat' is created from a gui input and everytime the input changes so does the .dat file. Now I need to loop this program so that everytime the input changes the program runs, but i dont want it to run endlessly i want it to wait for the .dat file to be changed.

Thank you

while 
    F=load('steps.dat')
   for motornum= 1:3
    direc= sign(F(motornum))
    steps=abs(F(motornum))
   end
end

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Sam Soifer 2018-11-19

编辑：Sam Soifer 2018-11-19

The gui Is a forward/ inverse kinematic solution that calculates the number of steps for 3 diffirent motors to move. This command will than be sent to arduino.

Luna 2018-11-20

Your gui element means when you import your .dat file to your gui by using a browse button, etc.

Define a callback function for that uicontrol object then you can do what ever you want, each time you clicked the button matlab calls the callback function.

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采纳的回答

Mark Sherstan 2018-11-19

0
链接

此回答的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/430838-how-do-i-loop-a-program-that-waits-for-a-dat-file-to-be-updated#answer_347902

在 MATLAB Online 中打开

Depending on the size of your .dat file this may work for your application:

while 
   while ~isfile('steps.dat'); end
   
   F = load('steps.dat');
   
   for motornum = 1:3
    direc = sign(F(motornum));
    steps = abs(F(motornum));
   end
   
   delete steps.dat
end

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Mark Sherstan 2018-11-20

Something from your GUI writing the file isent being initialized then. It worked for me when I dragged the file into the directory.

Sam Soifer 2018-11-20

在 MATLAB Online 中打开

This is the line of code from my GUI that I am using to write the .dat file

save('steps.dat','FxStep','FyStep','FzStep','-ascii')

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