How to select rows of matrix based on other matrix column?
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Hi, I have a single column matrix called "nodes" and a larger matrix with many columns called "arcs". If values from "nodes" appear in both of the first two columns of "arcs", I want to return that row from "arcs" and put it in a new matrix. If one or both of the values in the first two columns of "arcs" does not appear in "nodes", do not return that row.
For example, if these are the matrices nodes and arcs, I want to produce "arcssmall"
nodes = [1
2
4
6
9
11]
arcs = [1 2 0 1 4
1 3 9 8 7
2 1 8 3 0.5
4 11 9 0 0
6 9 5 5 5
5 6 1 2 3
9 1 0 0 0
7 8 6 7 7]
arcssmall = [1 2 0 1 4
2 1 8 3 0.5
4 11 9 0 0
6 9 5 5 5
9 1 0 0 0]
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Voss
2022년 3월 22일
nodes = [1
2
4
6
9
11];
arcs = [1 2 0 1 4
1 3 9 8 7
2 1 8 3 0.5
4 11 9 0 0
6 9 5 5 5
5 6 1 2 3
9 1 0 0 0
7 8 6 7 7];
arcssmall = arcs(all(ismember(arcs(:,[1 2]),nodes),2),:)
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Voss
2022년 3월 24일
편집: Voss
2022년 3월 24일
nodes = [1
2
4
6
9
11];
arcs = [1 2 0 1 4
1 3 9 8 7
2 1 8 3 0.5
4 11 9 0 0
6 9 5 5 5
5 6 1 2 3
9 1 0 0 0
7 8 6 7 7];
% arcssmall = arcs(all(ismember(arcs(:,[1 2]),nodes),2),:)
arcssmall = arcs(ismember(arcs(:,1),nodes),:) % change [1 2] to just 1, and no need to use all(__,2) in this case
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