CODEWITHSUNDEEP
matlabsyntax-error
Simplicity
Simplicity

Reputation: 48916

imwrite - A file name must be supplied

I have the following imwrite statement:

imwrite(img, strcat(thisdir,'_',num2str(j),'_LABEL_',categoryClassifier.Labels(labelIdx),'.jpg'));

where categoryClassifier.Labels(labelIdx) returns a string, and thisdir is also a string returning the directory name. But, I get 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{:});

Isn't the part from strcat considered the filename?

Thanks.

Upvotes: 0

Views: 909

Answers (1)

KQS
KQS

Reputation: 1597

This is kinda a shot in the dark, but I suspect that you want categoryClassifier.Labels{labelIdx} rather than categoryClassifier.Labels(labelIdx) (the difference is the curly braces).

Assuming that categoryClassifier.Labels is a cell array of strings, the curly braces give you the contents of that cell (which is what you want), whereas the parentheses give you a 1x1 cell array (which looks a lot like a string in MATLAB's command window). Note also that strcat is perfectly happy to process a cell array of strings, so it doesn't complain, but imwrite freaks out because none of its arguments are a string.

Upvotes: 1

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