How to change directory in a for loop

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Md
Md 2014-3-27
编辑： per isakson 2014-3-28
Hey Guys, I have a .mat file where I have written all the directories I will use. Lets say one of the directory is 'C:\Users\md\Desktop\A_I_001'. I want to make this directory changed in each iteration. so, the 'j' value will change in each time. How I can do that? Thanks in advance.
load tmp.mat; j='directory'; a = j; A =dir( fullfile(a, '*.png') );

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per isakson
per isakson 2014-3-27
编辑：per isakson 2014-3-27
Load the mat-file content to a variable
S = load('tmp.mat');
Inspect S to learn how the folder names are stored. I can only guess and assumes that in the mat-file each folder name is in one string variable. If so this loop should work
for folder_name = transpose( fieldnames( S ) )
A = dir( fullfile( S.(folder_name{:}), '*.png' );
...
...
end
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Md
Md 2014-3-28
Hi, Thank you for your answer This is the output that I can see
Name Size Bytes Class Attributes
tmp 1x1 300 cell
per isakson
per isakson 2014-3-28
编辑：per isakson 2014-3-28
tmp is a scalar, 1x1. What does
tmp{:}
show? And
S = load('tmp.mat')
?
Search a way to display the folder names in the command window and show the commands needed.

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