fprintf inside loops: How to write to text file or Excel?

I am working on a research project and have developed a code that loops using different input parameters. At the end of the code I use fprintf to print the final results which looks like the image below (and continues for several hundred lines). How can I write these results to a txt or Excel file? I am using fprintf within the loops which makes it difficult.

Answer 1

[Albert Fan]

You can use fopen() to open a file and then use fprintf to write to that file.

I've created a simple example:

f = fopen('test.txt', 'w')
for i=1:10
  fprintf(f, "Hello: %d\n", i);
end
fclose(f)

And it looks like:

So long as you do not call fclose(), you are able to call fprintf() anywhere with f to write whatever you want to the file you've opened.

The documentation page for fopen is here

The documentation page for fprintf is here. What I've used in my example is: fprintf(fileID,formatSpec,A1,...,An), where the fileID is what is returned by fopen()

Regarding to how to save your data to excel, you can refer to this link, or you can change your code a little bit to incorporate xlswrite(), which is a function designed to write stuff to excel. Or you can write your data in csv, open in Excel, and then save it as .xls or .xlsx file

Answer 2

[Bjarte]

It worked! However, I had to replace 'w' with 'a+' in order for it to not replace existing contents in the loops. Thank you very much for your help!