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Vectorised cell search and logical indexing

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Joshua
Joshua 2017-9-21
编辑： Cedric 2017-9-21
Hello, I would like to know if there is a vectorised/cellfun/better approach to the loop below:
% Find Key 4 in block_new{:}(1,1)
Key4 = '=x';
index4 = cellfun(@(x)regexp(x, Key4), block_new, 'UniformOutput', false);
Logic = false(length(index4),1);
for i = 1 : length(index4)
Logic(i) = ~isempty(cell2mat(index4{i}(1,1)));
end
index4 = Logic;
block_set = block_new(:,index4);
Where the cells in the 1 X m cell array, block_new are in themselves cell arrays of various sizes.
I have already tried the following:
find(~cellfun(@isempty,index4{:}(1,1)))
Thanks in advance.
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Joshua
Joshua 2017-9-21
Yes. A typical example, let's say block_new{i} would contain:
block_new{i}(1,1) -> String
block_new{i}(1,2:n} -> String of comma delimited doubles
Jan
Jan 2017-9-21
~isempty(cell2mat(index4{i}(1,1)));
If the output of cell2mat is empty, the cell must have been empty already. What about:
~isempty(index4{i}{1})
instead?
Please post a relevant input array.

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回答（1 个）

Jos (10584)
Jos (10584) 2017-9-21
regex can work on a cell array of strings directly:
block_new = {'abcd=x','abcd','a=xbc=x'}
index4 = regexp('block_new','=x')
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Jos (10584)
Jos (10584) 2017-9-21
Some cells are cell array of strings themselves? Kind of complicated data structure ...
Cedric
Cedric 2017-9-21
编辑：Cedric 2017-9-21
As mentioned by Jan, it would be simpler if you would attach a sample data set. Also, if you could describe in words what you are trying to achieve, that could help because you are doing a lot of operations that seem unnecessary (but that may in fact be necessary depending the final purpose).

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