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imwrite with variable filename

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Nicolas
Nicolas 2013-10-30
评论： Walter Roberson 2016-4-9
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!

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采纳的回答

Azzi Abdelmalek
Azzi Abdelmalek 2013-10-30
Correct this line
write_dir = strcat(ori_dir, '/', files{k},'.tif')
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Walter Roberson
Walter Roberson 2016-4-9
bill jones comments
doesnt actually provide an answer.
Walter Roberson
Walter Roberson 2016-4-9
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.

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