How can I get the elements from a matrix and use them as the coordinates in another matrix

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giorgos kazas 2020-2-10

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评论： giorgos kazas 2020-2-10

采纳的回答： Matt J

I have a matrix

W=[1 3 4 1

1 2 3 1

1 2 4 1]

and I want to get the values of another matrix

C=[0 3 7 8

3 0 1 4

7 1 0 2

8 4 2 0].

That is, I want to take firstly the values of C which exist in (1,3) position, (3,4) position and (4,1) position (the first row of W), i.e. 7,2 and 8 respectively in matrix C and the sum of these values (18). The same indeed for all the rows.

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Matt J 2020-2-10

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编辑：Matt J 2020-2-10

在 MATLAB Online 中打开

D = C(  sub2ind(  size(C), W(:,1:end-1), W(:,2:end)  )  ),
sum(D,2)

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giorgos kazas 2020-2-10

Thank you very much!

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