file size determination problem

when I type a code:

size=file.bytes

it shows "Insufficient number of outputs from right hand side of equal sign to satisfy assignment".

Answer 1

[Steven Lord]

Your file variable is an empty struct array. Assuming you created it using the dir function, as I suspect is the case, the directory whose contents you tried to list contained no files that matched the file/directory specification.

cd(tempdir)
mkdir directoryWithNoFiles
cd directoryWithNoFiles
file = dir('*.m'); % There aren't any in this newly-created directory
sz = file.bytes % Error

To avoid this, check that your struct variable is not empty using the isempty function before attempting to use the contents.

if isempty(file)
  fprintf('The directory contained no files with the .m extension.\n');
else
  fprintf('The directory contained %d files with the .m extension.\n', numel(file))
end

Answer 2

[Walter Roberson]

size = [file.bytes]

Your "file" is a structure array and you are getting "structure expansion" happening.