i have developed a gui with a plotting area , now the problem is i need to transfer the results of the calculation that are being used in plotting to be shown in the text file so can you suggest me how to do that on clicking the plot button.

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rohith adulla 2014-6-4

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评论： rohith adulla 2014-6-10

i have developed a gui with a plotting area , now the problem is i need to transfer the results of the calculation that are being used in plotting to be shown in the text file so can you suggest me how to do that on clicking the plot button.

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Geoff Hayes 2014-6-4

Rohith - in the future, rather than copying and pasting the body of your question in to the header/title, keep the latter short and clear.

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Geoff Hayes 2014-6-4

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Your GUI button needs a callback that will be invoked whenever the user presses the button. If the button name is pushbutton1 then your GUI m file should have something like the following defined within it

 % --- Executes on button press in pushbutton1.
 function pushbutton1_Callback(hObject, eventdata, handles)
 % hObject    handle to pushbutton1 (see GCBO)
 % eventdata  reserved - to be defined in a future version of MATLAB
 % handles    structure with handles and user data (see GUIDATA)

In the body of this function you will plot the data (since you have called this the plot button) and write the data to file:

 % plot the data
 % open a text file
 fid = fopen('fileToWriteTo.txt','w');
 if fid>0
    % write the data to file (this may require a loop given your data set)
    fprintf(fid,'formatString',dataToWriteA,dataToWriteB, etc...);
    % close the file
    fclose(fid);
 end

The formatString in the above describes the format of the data (integers, floats, strings, etc.) and the dataToWriteX is the data to write to file. In the command window type help fprintf or doc fprintf for details on how to use this function.

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Geoff Hayes 2014-6-10

编辑：Geoff Hayes 2014-6-10

在 MATLAB Online 中打开

Huh. I figured something like that you would have been able to determine on your own by running the code and observing the results. Look at the details for fopen (in the Command Window, type help fopen or doc fopen) or use this link http://www.mathworks.com/help/matlab/ref/fopen.html. Scroll down to the section on permission - File access type. Expand this section. Note the file access type for 'w'. It reads as follows

Open or create new file for writing. Discard existing contents, if any.

So if a file does not exist, a new one is created. If a file does exist, then its contents are cleared and it will be as if a new file has been created.

rohith adulla 2014-6-10