Error using cd command

I have a problem in cd command

    for i=1:length(Arr)
     cd(category{:,i});
  ..... etc

category is vector that contain directories names. when I try to run it, the following error comes: "Argument must contain a character vector"

What is the problem? How can I fix it?

I'm using matlab 2016 for mac thank you.

Answer 1

[Walter Roberson]

Your use of

cd(category{:,i});

suggests that you are extracting a row of elements rather than a single element. A single element would be expected to look like

cd(category{1,i});

or

cd(category{i});

[shahad moh]

I tried them, but still genrates same problem

[Walter Roberson]

What is class(category{1,1}) and size(category[1,1}) ?