myMatrix[myVector < .5,]
or
subset(myMatrix,myVector< .5)
- Phil Spector
Statistical Computing Facility
Department of Statistics
UC Berkeley
[EMAIL PROTECTED]
On Tue, 4 Apr 2006, mark salsburg wrote:
> 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..
>
> [[alternative HTML version deleted]]
>
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