Need help with sprintf formatting

So I have an sprintf statement in a for loop that looks like this:

run='4-QRSVH';
field='by';
files=21;
for f=1:files
    fn=sprintf('./data/%s/%s%d.dat', run, field, (f-1)*10000 );
end

In the first loop the value of fn is './data/4-QRSVH/by0.dat' as it should be but then when the loop goes through the next iteration the last part is entirely messed up. It becomes an enormous string and I'm not sure how to fix it. Any suggestions?

[Walter Roberson]

Could you give an example? The code appears to work for me.

[Jesse Randall]

Yeah I just tried it in a separate file and it worked. There is a lot more in my code but this is where the issue occurred. I'll look through it more thoroughly and let you know if I find a fix.

[Jesse Randall]

Ahhhh I found the issue. I added a variable that already existed so it gets overwritten. Thanks for the reply!

[Philip Borghesani]

Doing that is usually a good clue that your script (or function) is getting too large and needs to be broken up.