...and ?mget for retrieving multiple objects as a list. /Henrik On Thu, Jun 9, 2011 at 10:32 PM, Henrik Bengtsson <h...@biostat.ucsf.edu> wrote: > See ?get and ?do.call. That should be enough. > > ?Reduce may be an alternative for do.call(), but could also be less > memory efficient. > > My $.02 > > /Henrik > > On Thu, Jun 9, 2011 at 7:57 PM, Ben Zaitchik <zaitc...@jhu.edu> wrote: >> Hello, >> >> I have a large number of raster objects in memory, with names RH100, RH101, >> RH102, etc. (myobjects <- ls(pattern='^RH')). >> These rasters are sections of a continuous map, and I would like to combine >> them using the RasterObject merge tool in package 'raster.' >> >> Merge expects an input list of raster objects (outmap<-merge(x, y, ...), >> where x, y, and ... are raster objects). I can run the command successfully >> if I type in every raster object that I want to merge, but this is >> impractical for the large number of objects I'm combining. >> >> I would like to apply merge to a list of object names defined using some >> kind of wildcard-based list command, but I'm struggling to find the right >> data types in R. >> >> Is there some way to convert a vector of strings (e.g., >> as.vector(ls(pattern='^RH'))) to a vector of object names (as.names??) that >> could be specified as the input to the merge function? What I'd really like >> to do is something like outmap<-merge(myobjects[1:40]), in order to merge >> the 40 raster objects, but I recognize that it might not be so simple. >> >> Advance apologies if this is already dealt with on the help list . . . I've >> gone in circles on wildcard, lapply, and names threads and haven't managed >> to get anything to work. >> >> Thank you, >> Ben >> >> ______________________________________________ >> R-help@r-project.org mailing list >> https://stat.ethz.ch/mailman/listinfo/r-help >> PLEASE do read the posting guide http://www.R-project.org/posting-guide.html >> and provide commented, minimal, self-contained, reproducible code. >> >
______________________________________________ R-help@r-project.org mailing list https://stat.ethz.ch/mailman/listinfo/r-help PLEASE do read the posting guide http://www.R-project.org/posting-guide.html and provide commented, minimal, self-contained, reproducible code.