I have two objects, one matrix and one vector.

I want to use my vector to subset certain values out of my matrix.

For example:

I want to tell R, to select out all rows in myMatrix into a new myMatrix2 IF
that corresponding row is less than a 0.5 in myVector.

So:

myMatrix = a matrix of 8000 by 20
myVector = vector of 8000

myMatrix2 = a matrix of < 8000 by 20 (based on selection criteria in
myVector)

I hope this makes sense..

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