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# Using logical indexing to plot points meeting a specific criteria only.

Posted by Doug Hull,

If you have a vector of coordinate for a set of points, you might want to differentiate those points. To do that a concept called logical indexing will help you pull out a subset of those points easily. Here is a quick example (See the second video for more details)

>> L = logical([0 1 0 1])

L =

0     1     0     1

>> a = [1 2 3 4]

a =

1     2     3     4

>> a(L)

ans =

2     4


The above video made practical use of logical indexing. The video below shows logical indexing in a more academic treatment.

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