How to Edit Imported Notepad Values and Save the New Values

I want to import a row of data that looks like:

0.09 0.45 45 0 0.006 0.242 4.67 4 0.89925 1

Set them equal to variables in my GUI

Edit the variables

Save the new values over the old ones

Here is what I have:

[filename, path] = uigetfile('*.txt');
            figure(app.UIFigure);
            app.T = readtable(filename, 'Delimiter', 'space');
            ct = app.T(:,1);
            cr = app.T(:,2);
            
            app.ctEditField.Value = table2array(ct);
            app.crEditField.Value = table2array(cr);

(excluded the other 8 variable since it seems redunant)

Each value edit field has the same function

            value = app.ctEditField.Value;

To edit the variables, I did this:

            app.T.ct(1) = app.ctEditField.Value;
            app.T.cr(1) =  app.crEditField.Value;

Then I save them:

                        Q = table2array(app.T(:,:));
fileid = fopen('name.txt','w');
fprintf(fileid, '%6.5f\n' , Q);

This results in the following output in my text file where I am only changing the value for ct to 5. The original data is on top of the new data in a column. I do not have an error message to debug. How do I properly edit/save the data to only include the updated data as a row of numbers rather than a column of numbers?

0.09000

0.45000

45.00000

0.00000

0.00600

0.24200

4.67000

4.00000

0.89925

1.00000

5.00000

0.45000

45.00000

0.00000

0.00600

0.24200

4.67000

4.00000

0.89925

1.00000

Answer 1

[Hornett]

I understand you are facing problem while updating the already existing values in text file.

You can try using the "writematrix" function to write output data to text file.

Here is the sample code for “writematrix” usage:

M = magic(5) 
writematrix(M,'mytxt.txt','Delimiter','  ') 

For more detail you can refer to the following documentation page on writematrix function: https://www.mathworks.com/help/matlab/ref/writematrix.html

I hope this information resolves your query.