[R] tapply output as a dataframe

[Phil Spector]

Try
       as.data.frame(as.table(a))

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


On Thu, 3 Feb 2011, Graves, Gregory wrote:

> On Mon, Apr 13, 2009 at 12:41 PM, Dan Dube <ddube-at-advisen.com> wrote:
>
>> i use tapply and by often, but i always end up banging my head against
>> the wall with the output.
>
> The proposed solution of Dan's problem posted on R-help was:
>
>> do.call(rbind,a)
>
> When I use this 'solution' I get 'ERROR:  second argument must be a list'.  So head on wall continues.
>
> My tapply output is generated as follows:
>
>> a=tapply(value,list(sampling.date,station.code),mean)
>
> which gives me this (in part):
>
>             A     B     C     D     E     F     G     H     I     J      K
> 1/15/2008  0.004 0.027 0.019 0.015 0.035 0.022 0.007 0.038 0.042 0.045 0.0350
> 1/15/2009  0.027 0.027 0.031 0.015 0.008 0.021 0.007 0.027 0.026 0.029 0.0210
> 1/15/2010  0.016 0.020 0.015 0.022 0.015 0.013 0.007 0.014 0.019 0.019 0.0180
> 10/15/2007 0.052 0.051 0.032 0.024 0.017 0.044 0.015 0.058 0.063 0.061 0.0640
> 10/15/2008 0.042 0.054 0.030 0.017 0.024 0.030 0.019 0.044 0.047 0.051 0.0390
> 10/15/2009 0.047 0.035 0.031 0.020 0.012 0.039 0.019 0.051 0.055 0.054 0.0350
>
> The only way I can figure out how to resolve this, such that I can, for example, plot station "A" against date, is to export the tapply output as a csv, and then reimport.
>
> Suggestions?  I couldn't find a solution to this likely SIMPLE problem in Crawley or multiple searches of R help.
>
> Gregory A. Graves, Lead Scientist
> Everglades REstoration COoordination and VERification (RECOVER)
> Wetland Watershed Sciences / Restoration Sciences Department
> South Florida Water Management District
> Phones:  DESK: 561 / 682 - 2429
>                    CELL:  561 / 719 - 8157
>
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