How to count the total number of occurrences of each digit avoiding the first elements of each cell?

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Md Shahidullah Kawsar
评论： Guillaume 2018-11-7
Suppose I have a cell array
C = {[1; 4; 7]; [2; 5; 8; 9]; [3; 4]};
c{:}
ans =
1
4
7
ans =
2
5
8
9
ans=
3
4
% where any digit won't repeat in the individual cell.
% There are 4 stages in this cell array.
% first stage elements are 1, 2, 3
% second stage elements are 4, 5, 4
% third stage elements are 7,8
% fourth stage elements are 9
I need to count the total number of occurrences of each digit except stage 1 that means by avoiding the first elements of each cell. Expected output:
Digit | Number of occurrences
4 2
5 1
7 1
8 1
9 1

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采纳的回答

Nick
Nick 2018-11-7
编辑：Nick 2018-11-7
You could do the following if you don't mind using some for loops
% example data
C = {[1; 4; 7]; [2; 5; 8; 9]; [3; 4]};
% get the highest digit to make an array in which you store your count
highestDigit = max(cell2mat(C));
countArray = zeros(2, highestDigit);
% replace the second row with the digits
countArray(2,:) = 1:highestDigit;
% then loop over the cell array
for ii = 1:numel(C)
digits = C{ii}(2:end); % filter out the first digit
for jj=1:numel(digits)
countArray(1,digits(jj)) = countArray(1,digits(jj)) + 1; % add one every time it occurs
end
end
% remove the zeros
maskZeros = countArray(1,:)~=0;
countArray = countArray(:,maskZeros);
% print the result
fprintf('Digit | Number of occurrenced \n')
for ii = 1:length(countArray)
fprintf('%d %d \n',countArray(2, ii), countArray(1,ii));
end
  2 个评论
Nick
Nick 2018-11-7
It depends how you want to display it:
Only showing the numbers that occurred you can do
figure;
binNames = strsplit(num2str(countArray(2,:)),' ');
h = histogram('Categories', binNames,'BinCounts', countArray(1,:));
Or if you want to show a real histogram by not removing the zeros. Just remove the following lines
maskZeros = countArray(1,:)~=0;
countArray = countArray(:,maskZeros);
and then add this command the end.
binEdges = [0, countArray(2,:)]+0.5;
h = histogram('BinEdges', binEdges,'BinCounts', countArray(1,:));
When first starting its always handy to explore the properties of the object handle (h) so you know how you can customize your histogram.

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