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Comparing matrices with different dimensions

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Mahi Nazir
Mahi Nazir 2013-9-27
回答： dpb 2013-9-27
I have a matrix [row, col, vector] with a large number of entries for row, col and vector.
I have another matrix [x, y] with few entries.
I want to derive a matrix [xr, yc, zv] for all the values for which (x==row and y==col) and zv should be the corresponding value of 'vector' for which (x=row and y=col)
e.g:
[row col vector]= 2 2 4;
3 2 6;
7 1 8;
5 2 3;
8 1 7;
[x y]= 3 2;
8 1
then, [xr yc zv] should equal = 3 2 6;
8 1 7
Your help will be greatly appreciated. Thanks!

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采纳的回答

Image Analyst
Image Analyst 2013-9-27
Use ismember() with the rows option:
m= [2 2 4;
3 2 6;
7 1 8;
5 2 3;
8 1 7]
m2= [3 2;
8 1
7 3]
matches = ismember(m(:,1:2), m2, 'rows')
out = m(matches,:)

更多回答（1 个）

dpb
dpb 2013-9-27
Since your values are in the first two columns, it's fairly easily written...
>> res=a(ismember(a(:,1:2),v,'rows'),:)
res =
3 2 6
8 1 7
>>

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