how do i select data from a column based on another column?

2016 5 11
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Basically, I have two data columns: one with depth, the following column with its corresponding temperature. However the depth is in a random order with no sort of set intervals either.
How would I for example find all values for Temperature (column 2) for when depth (column 1) equals Zero?
Thanks, Pietro

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Azzi Abdelmalek
Azzi Abdelmalek 2016-5-11
编辑：Azzi Abdelmalek 2016-5-11

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a=[1 2;3 4;5 0;5 1;1 0;7 8;4 0]
out=a(a(:,2)==0,:)

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Pietro Dinmore
Pietro Dinmore 2016-5-11
thanks a lot! is there any way to loop it so that I can get separate columns for each depth?
When I attempt to loop it now, it remains within the same matrix. so basically im getting everything put in order of increasing depth.

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