Mapping indices of matrices with differing dimension

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Joshua Goglio
Joshua Goglio 2018-7-18
编辑： Guillaume 2018-7-18
This seems simple, but I cannot find an answer to my specific question. Take the matrices below:
x = [5 3 7 0 1];
y = [1 3 3 1; 2 2 2 2; 3 5 5 3; 1 3 3 1];
I'd like to create a new matrix 'z' that takes each element of 'y' and pulls the value of 'x' using the 'y' value as an index of 'x':
z = [5 7 7 5; 3 3 3 3; 7 1 1 7; 5 7 7 5];
Kind of like x(y) but for matrices of differing dimension.
My real question is whether this can be done without a for loop, since I'm new to MATLAB and not as familiar with matrix manipulation as I could be.

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Guillaume
Guillaume 2018-7-18
编辑：Guillaume 2018-7-18
Well have you try x(y)? It will give you exactly your desired z.
Note that the rule of A(B) indexing is that it is the same shape as B unless both A and B are vectors (in which case, absurdly, it is the same shape as A).

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