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How to find the value of a matrix in a specific position?

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abbxucy11
abbxucy11 2016-9-13
编辑： Stephen23 2016-9-13
I have a matrix A with the positions (361x2) stored and i want to find the values of another matrix B in the specific positions ..how can i do it?
  2 个评论
abbxucy11
abbxucy11 2016-9-13
I have this code here and i found the location of all the values from -180 to 180 and stored them using the save command. It saves the locations in a function named find_results that is a matrix 361x2.
or=flow.Orientation; ordeg=(180*or)/pi; ORIENT=round(ordeg)
for a= 180:-1:-180
[i,j]=find(ORIENT==a)
end
save('test.mat','i','j')
Then, i have another matrix named magnitude and i want to find the values of each location that there is in the find_results matrix

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采纳的回答

Adam
Adam 2016-9-13
sz = size( B );
idx = sub2ind( sz, A(:,1), A(:,2) );
res = B( idx );

更多回答（1 个）

Stephen23
Stephen23 2016-9-13
编辑：Stephen23 2016-9-13
You can use sub2ind:
idx = sub2ind(size(B), A(:,1), A(:,2));
out = B(idx);

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