I am having trouble writing my matrix to a text file.

I am trying to write my variable, textfiledata, to a text file. textfiledata is a nx4 matrix where n changes each iteration. I added labels to each of the four columns using:

header = {'time' 'A1'  'A2' 'INT'};
textfiledata=[header;num2cell(textdataWITHOUTheader)];

I am not sure how to save this matrix to a text file to a designated directory. i tried using save but ran into ASCII errors. I have also tried dlmwrite with no luck.

Thank you for your help.

Answer 1

[Walter Roberson]

fid = fopen('OutputFileNameGoesHere.txt', 'wt');
tdflip = textfiledata .';
fprintf('%s\t%s\t%s\t%s\n', tdflip{:});
fclose(fid);

[Matt Mallory]

Thank you for the reply, Walter. When I open the created text file, it is completely empty. Any thoughts on why this would be?

Thanks

[Walter Roberson]

Hmmmm, no, not unless you missed the fclose() or textfiledata was somehow empty (which it should not be since you put the header in there)

[Matt Mallory]

OutputFileNameGoesHere.txt you listed above can be another directory, correct? Fprintf is not limited to saving in just the current directory?

[Walter Roberson]

fopen() is responsible for the file creation, and yes, it can list a different directory. Read in the usual remarks about making sure the relative path is correct if you are using a relative path, and the usual recommendation to use fullfile() to build paths . It wouldn't hurt to test the outcome of the fopen either:

filename = 'OutputFileNameGoesHere.txt';
[fid, msg] = fopen(filename, 'wt');
if fid < 0
  fprintf('Failed to open file "%s" because: "%s"\n', filename, msg);
else
 ....
end

[Matt Mallory]

tested the outcome, still no luck.

Thanks for the help though!

[Walter Roberson]

You are doing num2cell on a variable named "textdataWITHOUTheader". That would be a valid call to make on a char array, if the desired result were one character per cell, but I have to wonder whether textdataWITHOUTheader is perhaps numeric instead of a char array? If it is numeric then we would need to format differently.