error with changing directory in for loop

I'm having a problem with "cd" when looping through folders using an SSH (Putty). Here is the relevant part of my function:

for ii = 1:10

parfor i=1:size(xmat,1)
    
file = sprintf('res_%d',i);
    x0 = xmat(i,:);
    [t,Y] = hackathon_ode(x0);
    myFolder = cd(['output/mat_npaths_1000/np_10000_binsz_0.01/' int2str(ii) '/']);
    dlmwrite(file, [t Y], ' ')
    
    x1 = xmat1(i,:);
    [t,Y] = hackathon_ode(x1);
    myFolder = cd(['output/mat_npaths_1000/np_10000_binsz_0.1/' int2str(ii) '/']);
    dlmwrite(file, [t Y], ' ')
   

And I get this as an output:

    cannot CD to  
    /output/mat_npaths_1000/np_10000_binsz_0.1/1/output/mat_npaths_1000/np_10000_binsz_0.1/1
    (Name is nonexistent or not a directory).

This is what it should look like:

    /output/mat_npaths_1000/np_10000_binsz_0.1/1

When I run this from my computer it works fine. Can anyone see what I'm missing and why it repeats the directory on Putty?

Answer 1

[Adam Danz]

Do not use cd(); use fullfile() instead and then feed in the full path of the file to dlmwrite().

[Steven Lord]

I agree with Adam Danz's suggestion. As an explanation for what's happening: you cd into a directory but then never return to the directory you were in before the cd call. Therefore when you cd a second time, you're changing to a directory relative to where you were after your first cd.

Or to use a whimsical example: you're doing the Hokey Pokey by putting your right foot in then trying to put your right foot in again. You skipped the "put your right foot out" step inbetween.