[R] Factor to variable

[Phil Spector]

Try

   z$Col3 = as.numeric(sub('^X','',as.character(z$Col3)))

 					- Phil Spector
 					 Statistical Computing Facility
 					 Department of Statistics
 					 UC Berkeley
 					 spector at stat.berkeley.edu


On Sat, 5 Jun 2010, bjlwilkinson at gmail.com wrote:

> I have a data frame called z that includes four columns:
>
> Col1 Col2 Col3 Col4
> Text1 Text2 X0.1 5
> Text1 Text2 X0.2 10
> Text1 Text2 X0.3 15
> Text1 Text3 X0.1 5
> Text1 Text3 X0.2 10
> Text1 Text3 X0.3 15
>
> I am trying to convert the 3rd column to the numeric value excluding the X so that I can produce a lattice plot.
>
> I have tried a number of approaches including z$Col3[z$Col3=="X0.1"]="0.1" as a first step but get an error: invalid factor level NAs generated.
>
>
> Sent from my BlackBerry® wireless device
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