Remove specific rows from matrix
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I have two matrices shown below:
A =
0.2247 0.5845
0.4942 0.7303
0.5000 0.5000
0.6440 0.5408
0.6210 0.2230
0.6210 0.2230
0.2869 0.3921
1.0000 1.0000
B =
0.2247 0.5845
0.4942 0.7303
0.6440 0.5408
0.6210 0.2230
0.2869 0.3921
I would like to delete the rows in matrix A that match the rows from matrix B. How would I go about doing this?
Thanks in advance.
采纳的回答
If you're looking for exact matches use
However, with floating decimals it's likely that your variable values may differ slightly such as 0.28690123 vs 0.28690131. If you'd like that to be considered a match, use
To identify and remove the first match of B within A,
removeRowIdx = cell2mat(arrayfun(@(i) find(ismember(A,B(i,:),'rows'),1,'first'),(1:size(B,1))','UniformOutput',false));
A(removeRowIdx,:) = []
4 个评论
Adam Danz
2019-11-24
Hi John, I added two lines to the end of my answer that identifies and removes only the first matching row. This uses ismember() so the match must be a perfect match. With floating decimals you may want to use ismembertol() instead if you find that number that seem like perfect matches aren't being matched.
John D
2019-11-24
Adam Danz
2019-11-24
Glad I could help!
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