Creating a text file through Matlab

Hello,

I want to save parameters from a program that I am running to a separate text file, while the program is in progress.

For example, if my program defines (ycent,xcent)=(10,10) I want a text file to be created that writes

"(ycent,xcent)=(10,10)" on the first line.

I want to be able to keep adding data like this to the file, while the program is still running.

Does anyone know how to do something like this?

Thank you in advance for your replies!

Amina

Answer 1

[Fangjun Jiang]

What do you mean your program is in progress? If you want to keep a history of the commands executed in Command Window, use the diary() function.

Otherwise, the M-script or M-function you are running is the text file you want, right?

[A]

I mean that my program goes on to plot some graphs, etc, and I want to have a text file being populated with the parameters that I feed it while the mother program is still going about it's normal processing... if that makes sense!

[Fangjun Jiang]

In general, you can write anything to a text file.

At the beginning, create a file ID, fid=fopen('MyTextFile.txt,'w+t');

At any time you want to write, fprintf(fid,'ycent=%f;\n'); There are lots of options depending on your format need. help fprintf or sprintf for details.

At the end, fclose(fid);

[A]

Thank you! I will try it out and then accept the answer.

[A]

I have having a problem:

If, for example, I do:

fid=fopen('MyTextFile.txt','w+t');

fprintf('Hello %g.\n');

fclose(fid);

nothing is actually written to the text file when I open it through "display" later on. Any idea why this might be happening?

[Fangjun Jiang]

You need to specify fid for the fprintf(), and also provide a number.

fprintf(fid,'Hello %g.\n',1234)