How can I find and replace strings in a text file?

Hi,

I've written my table to a text file; however, I need this text file to be delimited by three spaces, which MATLAB doesn't allow using the 'writetable' function. Therefore, I must find and replace each instance of the ' ' string with the ' ' string in my text file. I also need to replace the first line of my text file with another string. How can I accomplish this?

I've tried to use textscan for this, but I keep getting the following error:

For visual clarity, here is what I am trying to accomplish with my text file:

(original)

(goal)

Answer 1

[Walter Roberson]

Skip the writetable.

filename = 'goal.txt';
[fid, msg] = fopen(filename, 'wt');
if fid < 0
    error('Failed to open output file "%s" because "%s"', filename, msg);
end
fprintf(fid, '"Time"   "X"   "Y"   "Pressure"\n');
fprintf(fid, '%g   %g   %g   %g\n', YourTable{:,:}.' );   %transpose is needed
fclose(fid);

[Michelle Uchenik]

Thank you!