How do I detect empty cells in a cell array? I know the command to remove the empty cell is a(1) = []
, but I can't seem to get MATLAB to automatically detect which cells are empty.
Background: I preallocated a cell array using a=cell(1,53)
. Then I used if exist(filename(i))
and textscan to check for a file, and read it in. As a result, when the filename(i)
does not exist, an empty cell results and we move onto the next file.
When I'm finished reading in all the files, I would like to delete the empty cells of a
. I tried if a(i)==[]
TF = isempty( A ) returns logical 1 ( true ) if A is empty, and logical 0 ( false ) otherwise.
When you have data to put into a cell array, create the array using the cell array construction operator, {}. You also can use {} to create an empty 0-by-0 cell array.
Use CELLFUN
%# find empty cells emptyCells = cellfun(@isempty,a); %# remove empty cells a(emptyCells) = [];
Note: a(i)==[]
won't work. If you want to know whether the the i-th cell is empty, you have to use curly brackets to access the content of the cell. Also, ==[]
evaluates to empty, instead of true
/false
, so you should use the command isempty
instead. In short: a(i)==[]
should be rewritten as isempty(a{i})
.
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