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.willi...@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.willi...@kew.org<mailto:jenny.willi...@kew.org>
> ******************
>
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> >
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> >
>
>
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--
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Integrated Biosciences PhD Candidate
University of Minnesota
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