[R] a remove question

[David Winsemius]

On Jan 16, 2011, at 4:08 PM, Erin Hodgess wrote:

> Dear R People:
>
> I have the following:
>
>> ls(pattern="NY*")
> [1] "CRAN_df"      "CRAN_df0"     "CRAN_df1"     "CRAN_mat"      
> "CRAN_sp"
> [6] "CRAN_spdf1"   "CRAN_spdf2"   "CRAN_spdf4"   "delauney_NY"   
> "dist2_NY"
> [11] "dist3_NY"     "Gabriel_NY"   "NY8a_nb"      "rel_neigh_NY"  
> "scot_BNG"
> [16] "SOI_NY"
>> rm(pattern="NY*")
> Warning message:
> In rm(pattern = "NY*") : object 'NY*' not found
>>
>
> How do I remove all of NY* items, please?  I suspect it might be an  
> sapply issue
> thanks,

Perhaps:

rm(list= ls()[grep("NY", ls()] )

If there is a pattern argument to rm (I haven't looked)  then it's  
possible that it would have succeeded with pattern="NY",  assuming you  
want any object name with "NY" someplace in it. The "*" looks wrong  
for grepping. ".+" would have looked more greppish, but its not really  
needed.

> Erin
>
>
> -- 
> Erin Hodgess
> Associate Professor
> Department of Computer and Mathematical Sciences
> University of Houston - Downtown
> mailto: erinm.hodgess at gmail.com
>
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David Winsemius, MD
West Hartford, CT