accessing multiple elements of matrix

Math Forum / Math Software / MATLAB / July 2008

accessing multiple elements of matrix

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Alistair Templeton - 16 Jul 2008 23:29 GMT

So I have a matrix A.
Elsewhere in my code I generate a vector x and vector y, for
example

x = [1 4 2]
y = [8 2 4]

what I'd like to do is recover the elements
A(1,8)
A(4,2)
A(2,4)

Is there a cleaner way to do this than something along the
lines of:

A(x+(y-1)*size(A,1))

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Walter Roberson - 16 Jul 2008 23:46 GMT

>x = [1 4 2]
>y = [8 2 4]

>what I'd like to do is recover the elements
>A(1,8)
>A(4,2)
>A(2,4)

A(sub2ind(size(A),x,y))

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Math Forum / Math Software / MATLAB / July 2008

accessing multiple elements of matrix