Indexing one matrix using elements of another

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Garima Sharma 2017-7-18

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https://ww2.mathworks.cn/matlabcentral/answers/349295-indexing-one-matrix-using-elements-of-another

评论： Garima Sharma 2017-7-18

I have a matrix p=[1,2,4] and want to retrieve elements of another matrix u =[1,11,7;2,3,5;9,10,8;15,16,17], using the column of p combined with its entry e.g. I want a matrix z=[1,3,17]

z(1,1) = u(entry in p(col1), 1); z(1,2) = u(entry in p(col2),2); z(1,3)=u(entry in p(col3), 3).

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Garima Sharma 2017-7-18

And I'm hoping for a solution without loops since my actual p matrix is 1000*1000, so I'd want the same behavior to replicate across rows of p. E.g. if p(2,1)=1, then z(2,1)=1, if p(2,2)=4, then z(2,2)=16.

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