On 11/20/2010 12:55 PM, David Winsemius wrote: > On Nov 20, 2010, at 3:25 PM, David Potts wrote: >> I am trying to call the R library function rosavent from the climatol >> package via the plr interface package to the postgres database.
>> # select w_graph();
>> ERROR: R interpreter expression evaluation error
>> DETAIL: Error in PLR7843132 <- function() { : could not find function
>> "rosavent"
>> CONTEXT: In PL/R function w_graph
>> I assume this means it can not find the rosavent function from the
>> climatol package.
>> I have loaded the climatol package using the following syntax
>> install.packages("climatol",lib="/home/dfuncs/r-lang/my-rlib")
> I'm not sure if not having loaded climatol is the source of your
> problem, but if it is, you have forgotten to load the package after
> installing it. Perhaps:
>
> require(climatol) # before the pdf(...) call
That would be needed for sure.
>> I assume that the an R process created by the plr interface will load a
>> library, does any body know how I tell it to load it?
The R interpreter works just like the command line one in that respect
-- load the needed library in one of the usual ways from within the R
function if you want to use it.
> This page:
> http://www.varlena.com/GeneralBits/Tidbits/bernier/art13mar04/graphingWithR.html
>
> makes me thing that PL/R passes r code pg.spi.exec (... calls. Does it
> matter that the illustration on that page uses str<<- pg.spi.exec (
> rahter than str<- ?
<<- puts the variable in the global environment so that it is preserved
across PL/R calls to the R interpreter.
> (This would seem to be the wrong place to be asking these questions.
> There are websites set up to mediate conversations between PL/R users.)
Correct. Please see:
http://www.joeconway.com/plr/
http://pgfoundry.org/mail/?group_id=1000247
HTH,
Joe
--
Joe Conway
credativ LLC: http://www.credativ.us
Linux, PostgreSQL, and general Open Source
Training, Service, Consulting, & 24x7 Support
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