I want the GUI to input a result from another m file in a static text box after clicking a push button.

I am trying to create a GUI using guide. I have a .m file which has a certain result.

power_difference = mean(adj_crank_power)-mean(trainer_power)

% Display the results using fprintf

if power_difference < -1

fprintf('The trainer over-estimates the power by %0.2fW.\n', abs(power_difference))

elseif power_difference > 1

fprintf('The trainer under-estimates the power by %0.2fW.\n', abs(power_difference))

else

fprintf('The trainer gives an accurate power reading compared to the crank.\n')

end

I want the fprintf result to appear in my static text box after clicking a push button

Answer 1

[Voss]

As I understand the situation, you have an m-file that contains the code you posted, and you want to run that m-file from your GUI and have the message printed by the m-file to the command line appear instead in a static text box in your GUI. Is that right?

If so, modify the m-file to return a character vector or string (make this optional, if you need to preserve the existing behavior of the m-file). Something like:

function out = get_power_message(adj_crank_power,trainer_power)
power_difference = mean(adj_crank_power)-mean(trainer_power);
if power_difference < -1
    out = sprintf('The trainer over-estimates the power by %0.2fW.', abs(power_difference));
elseif power_difference > 1
    out = sprintf('The trainer under-estimates the power by %0.2fW.', abs(power_difference));
else
    out = sprintf('The trainer gives an accurate power reading compared to the crank.');
end

Then call the function in your GUI with the appropriate inputs, and set the 'String' of your static text box to the result.

% for example:
msg = get_power_message(adj_crank_power,trainer_power);
set(handles.text_box,'String',msg);

[Gian Paulo]

when I tried that I got an error which says "Function definitions in a script must appear at the end of a file"

[Voss]

Try moving the function to the end of the file.

How do you have code for a GUIDE GUI in a script? Maybe you should upload the relevant files, using the paperclip icon.

Answer 2

[Jan]

function msg = YourFcn(your inputs)
power_difference = mean(adj_crank_power)-mean(trainer_power);
if power_difference < -1
    msg = sprintf('The trainer over-estimates the power by %0.2fW.', abs(power_difference));
elseif power_difference > 1
    msg = sprintf('The trainer under-estimates the power by %0.2fW.', abs(power_difference));
else
   msg = sprintf('The trainer gives an accurate power reading compared to the crank.');
end
end

Call this from inside the callback of the pushbutton

function pushbuttonCallback(ObjectH, EventData, handles)
msg = YourFcn(the inputs);  % No idea, where the inputs come from!
set(handles.staticText.String, msg);  % Insert the name of the handle
end