conditional array extraction based on control array

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Ivan
Ivan on 24 Jan 2013
I have the following problem:
For example, I have three arrays:
x = [1,2,3,4,5,6,7,8,9,10] and its corresponding y values: y = [21,43,77,54,38,24,99,64,77,33] and also a "control" array: c = [3,5,7,9]
Is it possible to somehow extract from 'y' only those entries that have corresponding entries in both 'x' and 'c' array and put them in for example 'z'? In this case z = [77,38,99,77]
Thanks.

Accepted Answer

Cedric Wannaz
Cedric Wannaz on 24 Jan 2013
Edited: Cedric Wannaz on 24 Jan 2013
For the second part of the question:
z = y(c) ;
What do you mean by "corresponding entries in x "? How do you define correspondence if x and y don't have the same number of elements?

More Answers (2)

Ivan
Ivan on 24 Jan 2013
I mean that only if entry exists in both 'x' and 'c' for instance '3' does, then to copy in this case 77 form 'y' into 'z'.
  1 Comment
Cedric Wannaz
Cedric Wannaz on 24 Jan 2013
Ok, so you can achieve that with intersect, as mentioned by Eric, below.

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Eric Sampson
Eric Sampson on 24 Jan 2013
If I understand your question correctly, try this:
z=y(intersect(x,c));

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