MATLAB: How to make cells consistent in dimensions by shortening

cell arraysMATLAB

Hi,

I have cell array P which contains something like this:

< 15×1 double > < 14×1 double > < 16×1 double > < 14×1 double >…

I'd like to concatenate all these into a single cell so I did the following:

Summary.D ={cell2mat(P)};

However, I got an error due to the inconsistent dimensions of different cells above. Since the number of rows in those cell range from 14 to 16, I could just reduce all the 14×1. However, I'm not sure how to shorten these cells. Could anyone help?

Thanks.

Best Answer

This works:

P = {cell(14,1) cell(16,1)}
P{1} = rand(14,1)
P{2} = rand(16,1)
Q = [];
for k1 = 1:size(P,2)
    Q = [Q; cell2mat(P(k1))];
end
Q                   % Display result

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MATLAB: How to concatenate matrices with different dimensions in a cell array to a numeric array

cell2mat(C);

Note though that this will only work if all cells of c contain row arrays as in your example. If there are also column arrays or randomly sized arrays a different solution is required.

If that is the case you should amend your example to ensure it covers the most complex case you wish to solve since providing a solution that over-solves the problem is a waste of time, hence the above works in the case you showed, but not in any generalised case.

MATLAB: Count element of cell array that are names

I was able to re-arrange Jan's code to make it work. For other in needs, this is how it works. I created the Pool manually as my data names were changing and were not a series. The typo mistake just comes from having 2 commas in histcounts as well as locB has the first l uppercase, therefore inconsistent with the line before.

I kept the data in the original 1x24 cell array containing the different SIZEx1 cell arrays on row 1 inside of it. Then I apply the following code:

TypeNames = {'Car1', 'Car2', 'Car3', 'Moto1', 'Moto2', 'Bike', 'Bus', 'Walk'}; 
for i = 1:length(type)
  [~, locB] = ismember(type{:,i}, TypeNames);
  TypeCount{i} = histcounts(locB, 'BinMethod', 'Integers');
end

Best Answer

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