# how to find the index value

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singh on 13 May 2015
Edited: James Tursa on 13 May 2015
suppose i have on matrix A
A= 2
3
5
7
8
10
i have another matrix B
B=
10 21
20 11
63 43
23 12
32 54
78 45
now i wish to get the value from A 7 and B 23 12 through index value.
suppose 7 value store in A 4 location now i get the 4 location values from B
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### Accepted Answer

James Tursa on 13 May 2015
Edited: James Tursa on 13 May 2015
If you are given the value 7 and want to find it in A and then get the corresponding row in B, then you could do this:
x = find(A==7);
r = B(x,:);
If you don't care about storing the index itself, then you can just use logical indexing directly:
r = B(A==7,:);
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