Hi Jenny,

Firstly, to my knowledge you cannot assign the output of cat to an object
(i.e. it only prints it).
Second, you can just add the 'collapse' option of the paste function.

individual.proj.quote <- paste(individual.proj, collapse = ",")

if you really want the quotes
individual.proj.quote <- paste(individual.proj, collapse='","')

but you will be stuck with some backslashes I can't recall the syntax to
remove.

Hope this serves your purposes
Cheers,

Charles


On Thu, Aug 8, 2013 at 10:05 AM, Jenny Williams <jenny.williams@kew.org>wrote:

> I am having difficulty storing the output of a for loop I have generated.
> All I want to do is find all the files that I have, create a string with
> all of the names in quotes and separated by commas. This is proving more
> difficult than I initially anticipated.
> I am sure it is either very simple or the construction of the for loop is
> not quite right
> The result gets automatically printed after the loop but I can't seem to
> save it.
> I have tried to create the element in advance but the result is the same:
> NULL
>
> individual.proj =
> Sys.glob("Arabica/proj_current/individual_projections/*.img", dirmark =
> FALSE)
> individual.proj
> [1]
> "Arabica/proj_current/individual_projections/proj_current_arabica_pa.data.tmp$pa.tab_Full_GBM.img"
>  [2]
> "Arabica/proj_current/individual_projections/proj_current_arabica_pa.data.tmp$pa.tab_Full_GLM.img"
>  [3]
> "Arabica/proj_current/individual_projections/proj_current_arabica_pa.data.tmp$pa.tab_Full_MARS.img"
>  [4]
> "Arabica/proj_current/individual_projections/proj_current_arabica_pa.data.tmp$pa.tab_Full_RF.img"
>  [5]
> "Arabica/proj_current/individual_projections/proj_current_arabica_pa.data.tmp$pa.tab_RUN10_GBM.img"
>
>
> ##generate loop to create string out of the table of projected files.
> L.ip = length(individual.proj)
>   for (i in 1:L.ip){
>            individual.proj.i <- individual.proj[i]
>            individual.proj.quote = cat(paste('"', individual.proj.i, '"',
> ',',sep=""))
>            }
>
> "Arabica/proj_current/individual_projections/proj_current_arabica_pa.data.tmp$pa.tab_Full_GBM.img","Arabica/proj_current/individual_projections/proj_current....
>
> ##print output string
> individual.proj.quote
> NULL
>
> #command to be applied to individual.proj.quote to removed the final comma
> from the string
> substr(individual.proj.quote, 1, nchar(individual.proj.quote)-1)
>
> Any help or pointers would be greatly appreciated, no amount of extensive
> google searches have been fruitful so far.
>
>
> ******************
> Jenny Williams
> Spatial Information Scientist, GIS Unit
> Herbarium, Library, Art & Archives Directorate
> Royal Botanic Gardens, Kew
> Richmond, TW9 3AB, UK
>
> Tel: +44 (0)208 332 5277
> email: jenny.williams@kew.org<mailto:jenny.williams@kew.org>
> ******************
>
> Film: The Forgotten Home of Coffee - Beyond the Gardens<
> http://www.youtube.com/watch?v=-uDtytKMKpA&sns=tw>
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> >
> How Kew's GIS team and South East Asia botanists are working to help
> conserve and restore a rainforest in Sumatra. Download a pdf of this
> article here.<
> http://www.kew.org/ucm/groups/public/documents/document/kppcont_060602.pdf
> >
>
>
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-- 
Charles Determan
Integrated Biosciences PhD Candidate
University of Minnesota

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