Matlab Appdesigner Saving Data to Text File

 % Button pushed function: SaveButton
        function SaveButtonPushed(app, event)
            app.t.Thrust(1) = str2num(app.SaveButton);
            fileid = fopen ('C:\**\**\**\**\***\**\****.txt')

Error using str2num (line 35)

Input must be a character vector or string scalar.

The above is the code giving me the problem.

I am just trying to save one number from my data to a text file and I got the above error.

Is there an alternate command to proceed with this step?

[Rik]

Why do you want to use str2num? You should be using str2double or textscan instead.

What data type is app.SaveButton?

[I]

What about this? I made some edits:

        % Button pushed function: SaveButton
        function SaveButtonPushed(app, event)
            D = str2double(app.UITable.Data); % Assigning a variable to the table
fileid = fopen ('C:\**\**\**\**\***\**\****.txt','w');
fprintf(fileid, '%6.2f' , D);

I am using str2double on my table of data and my text file output reads:

NaN

What should I to do in order to write the data from my table to the text file?

[Rik]

Is app.UITable.Data a numeric data type that is supported by str2double?

Answer 1

[I]

It seems I figured out the issue just based on your question alone.

I tried to just save the data straight to the text file and got an error returned

D = (app.UITable.Data(:,:)); % Assigning a variable to the table

Error using fprintf

Unable to convert 'table' value to 'double'.

Thist prompted me to "assume" that using an additional function was necessary. It's not. I don't completely know how to interact with app.UITable.Data, but I can extract the data entries. One of those entries is Thrust.

D = (app.t.Thrust(:,:));

The above resulted in:

0.00

1000.00

Problem solved.