How to generate text file in specific path

I have the following code

if (app.ChooseSourceDropDown.Value=='S1')
                sub_chs1=chs1(app.MinimumChannel.Value:app.MaximumChannel.Value, 1);
                Es1=c+d.*sub_chs1;
                M=[chs1 abss1 Es1];
                
                
                
                fid = fopen('DataS1_ch_count_E.txt','w');
                fprintf(fid,'%f\t %f\t %f\r\n',M');
                fclose(fid);

where chs1,abss1,Es1, are vector of data

I used the previous code to generate a text file the problem is that the file is generated at my selection in Current Folder, while i have a certain path that i want it to be generated in. the path is changable because it is generated by bowse button and i have that path named in variable. i want to know how to generate this text file in that variable that consist of path.

knowing that I am using app designer

Answer 1

[per isakson]

Replace

fid = fopen('DataS1_ch_count_E.txt','w');

by

filespec = fullfile( path_named_in_variable, 'DataS1_ch_count_E.txt' );
fid = fopen(filespec,'w');

[Moza aldhuhoori]

thank u veeery much it worked