[R] using subset() in data frame
Robert Walters
pungo9nc at embarqmail.com
Sat Feb 23 14:24:49 CET 2008
Erin Hodgess wrote:
> Hi Robert!
>
> Could you please check
> str(data.b)
>
> and see what you have for porosity? It needs to be a factor
>
> Thanks,
> Erin
>
>
Erin,
Yes, porosity is a factor. See output below.
> str(data.b)
'data.frame': 96 obs. of 7 variables:
$ system : Factor w/ 6 levels ...
$ block : int ...
$ position: Factor w/ 3 levels "inrow","interrow",..
$ depth : Factor w/ 2 levels "0-7.5cm","7-5-15cm": ...
$ porosity: Factor w/ 2 levels "macro ","micro":...
$ x : num 1.41 1.5 1.3 1.53 ...
$ y : num 12.10 14.60 23.30 ...
Robert
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