Extracting rows from a matrix based on values in columns

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Maria445
Maria445 2017-10-8
评论： Maria445 2017-10-8
Following on from this question
https://it.mathworks.com/matlabcentral/answers/283139-extracting-rows-from-a-matrix-based-on-values-in-columns
What if I have more than 1 column? That is, I want A to be a 6-by-4 matrix for example, so to have C{1} = 4-by-3 matrix?

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采纳的回答

Guillaume
Guillaume 2017-10-8
It's much easier to do this with the newer splitapply rather than the older accumarray:
A = [[1;1;3;2;3;1], rand(6, 3)]
C = splitapply(@(rows) {rows}, A(:, 2:end), A(:, 1))

更多回答（1 个）

Kaushik Lakshminarasimhan
for n=2:4, C_temp(:,n-1) = accumarray(A(:,1),A(:,n),[],@(n){n}); end
for m=1:size(C_temp,1), C{m} = cell2mat(C_temp(m,:)); end

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