imwrite with variable filename

Hi,

I'm trying to call imwrite in a loop:

ori_dir = 'path/to/folder'
files = {'fi','le','na','me'};
for k = 1:length(files)
   % do some operation on img %
   write_dir = strcat(ori_dir, '/', files(k),'.tif');
   imwrite(img, write_dir);
end

I'm getting the following error

Error using imwrite>parse_inputs (line 510)
A filename must be supplied.

Error in imwrite (line 418)
[data, map, filename, format, paramPairs] = parse_inputs(varargin{:});

write_dir contains a string to the correct path however. If I paste the string directly in imwrite, I don't have any issue, eg:

imwrite( img, 'path/to/folder/fi.tif')

does not raise an error.

I'm not quite sure what is wrong here. The variable files is a cell array with only strings in it.

Any help would be really appreciated!

Answer 1

[Azzi Abdelmalek]

Correct this line

write_dir = strcat(ori_dir, '/', files{k},'.tif')

[Nicolas]

Thanks Azzi! Really didn't see that :/

[Walter Roberson]

bill jones comments

doesnt actually provide an answer.

[Walter Roberson]

bill jones:

The original line was

   write_dir = strcat(ori_dir, '/', files(k),'.tif');

the new suggested line is

   write_dir = strcat(ori_dir, '/', files{k},'.tif');

This is different. Notice that files(k) has been changed to files{k} . files is a cell array of strings, so files(k) is a 1 x 1 cell array that contains a string. When you strcat() something that contains a cell array of strings, the result is a cell array of strings, but imwrite() cannot handle a file name which is a cell array of strings. files{k} on the other hand is the string extracted from the cell array. That leaves you strcat() only strings, which gives a string result, and imwrite() can deal with that.