MATLAB: How to find values greater than a number in a cell of empty cells

Question

Hello everyone,

I am trying to find the values greater than '0' in a cell array of few empty cells eg. D = {[],[],[3],[],[],[]}?

I have tried multiple options like

1. find(D{:}>=0)
2. [row,col] = cellfun(@(c) find(c >= 0), D, 'uniform', false)
3. for i = 1 : length(Match), idx(i) = find(Match{1,i}>=0);end
4. ismember(D,3);

But nothing has worked so far?

All the best,

Thanks

Answer 1

D =  {[],[],3,[], -2, 0, [], 1, 6, []};
idx = cellfun(@(x)~isempty(x) && x >= 0, D); % logical index

If you need the subscript index,

idx = find(cellfun(@(x)~isempty(x) && x >= 0, D)); % subscript index

If D contains non-scalars,

D =  {[],[],3,[], -2, 0, [], 1, 6, [], -2:2, magic(4)-8};
idx = cellfun(@(x)~isempty(x) & x >= 0, D, 'UniformOutput', false);

but now idx is a cell-array so to find the values >= 0 in element n of D, idx{n}.