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function N = cell2num(C)
% CELL2NUM Convert a 2D cell array to a 2D numeric array
% N = cell2num(C)
% If the cells contain column vectors, they must have the same number of rows in each row of C.
% Each column will be concatenated.
%
% Example 1:
% C = num2cell(rand(2,2))
% [0.4565] [0.8214]
% [0.0185] [0.4447]
% N = cell2num(C)
% 0.4565 0.8214
% 0.0185 0.4447
%
% Example 2:
% C = cell(2, 3);
% for i=1:2
% for j=1:3
% C{i,j} = rand(i, 1);
% end
% end
% C =
% [ 0.8998] [ 0.8216] [ 0.6449]
% [2x1 double] [2x1 double] [2x1 double]
% C{2,1} =
% 0.8180
% 0.6602
% N=cell2num(C)
% 0.8998 0.8216 0.6449
% 0.8180 0.3420 0.3412
% 0.6602 0.2897 0.5341
% error('use cell2mat in matlab 7')
if isempty(C)
N = [];
return;
end
if any(cellfun('isempty', C)) %any(isemptycell(C))
error('can''t convert cell array with empty cells to matrix')
end
[nrows ncols] = size(C);
%N = reshape(cat(1, C{:}), [nrows ncols]); % this only works if C only contains scalars
r = 0;
for i=1:nrows
r = r + size(C{i,1}, 1);
end
c = 0;
for j=1:ncols
c = c + size(C{1,j}, 2);
end
N = reshape(cat(1, C{:}), [r c]);
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