fprintf filename error

Im using fprintf to write some data onto text files and using the following code to define the text file:

        for i= 1:length(Table1);
            filename{i} = fullfile(CorrFile,[Fieldnames{i} '.txt']);
            fid{i} = fopen(filename{i},'wt');
        end

Can anyone see why this returns an error;

Cell contents assignment to a non-cell array object.

It seems really strange because if I type:

filename = fullfile(CorrFile,[Fieldnames{1} '.txt']);

it works fine, It just doesnt like to store the filenames in cells. How could I make this work?

In addition, I've used the same code for making text files in another script (filename{}) and it worked fine. I don't understand what is going wrong.

Answer 1

[Dr. Seis]

Is Fieldnames a string? Do:

ischar(Fieldnames)

if you get a 1, then it is not a cellstr and therefore cannot use {}.

[Richard]

It is a cellstr that was why I was so confused about why it didn't work. Pre-allocating the cell before hand managed to work though. thanks