Return values for specific set of indices

Question

Andrew Poissant 2017-4-18

0
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https://ww2.mathworks.cn/matlabcentral/answers/335990-return-values-for-specific-set-of-indices

评论： Andrew Poissant 2017-4-18

I am trying to find values in a matrix for specific indices. I have a 180x180 matrix, N, and have a range of dx and dy values. How do I scan matrix N to find values for which the combination of [i,j] coordinate in the matrix is the [dx,dy] pair values? For example, if dx(3) = 5 and dy(3) = 10, I want to return the matrix value at i = 5, j = 10. Or if I have dx(2) = 1, dy(2) = 5, I want to return the matrix value at i = 1 and j = 5. I want to do this over the entire range of dx and dy.

dx = [0 1 3 10 15 12 4 7];
dy = [1 4 62 1 33 4 10 22];
N11 = randi([0,5],45,45);
N12 = randi([1,4],45,45);
N13 = randi([0,7],45,45);
N14 = randi([0,6],45,45);
N21 = randi([1,3],45,45);
N22 = randi([1,7],45,45);
N23 = randi([4,6],45,45);
N24 = randi([2,7],45,45);
N31 = randi([1,4],45,45);
N32 = randi([6,7],45,45);
N33 = randi([1,7],45,45);
N34 = randi([3,4],45,45);
N41 = randi([2,5],45,45);
N42 = randi([0,3],45,45);
N43 = randi([5,6],45,45);
N44 = randi([0,4],45,45); 
N = [N11  N12  N13  N14;
     N21  N22  N23  N24;
     N31  N32  N33  N34;
     N41  N42  N43  N44];