[R] Variable String formation
dwinsemius at comcast.net
Thu Sep 22 20:21:15 CEST 2016
> On Sep 22, 2016, at 8:01 AM, Roy Mendelssohn - NOAA Federal <roy.mendelssohn at noaa.gov> wrote:
> Hi All:
> I am trying to write code to create a string to be executed as a command. The string will be of the form:
> "param <- param[,rev(seq_len(dataYLen)),,drop = FALSE]"
> Now just creating that string is simple enough. Where the problem arises is the array param could be 2, 3, or 4 dimensions, and the dimension where "rev(seq_len(dataYLen))" occurs can vary. At present I have the following solution:
> paramLen <- 3
> latLoc <- 2
> myComma1 <- paste(rep(',', times = (latLoc-1)), 'rev(seq_len(dataYLen))', sep="", collapse="")
> myComma2 <- paste(rep(',', times = (paramLen-latLoc+1)),sep="", collapse="")
> paramCommand <- paste0('param <- param[', myComma1, myComma2, 'drop = FALSE]')
> (paramLen can be 2,3,4 and latLoc can be 1,2,3,4) but this strikes me as pretty kludgy. I am hoping there is a more elegant way of doing this.
Take a look at this function to see if it allows you to make this cleaner:
(Author = Henrik Bengtsson; so you have can have confidence in its quality.)
Found with the ever-useful `findFn` function:
findFn("extract slice array")
found 28 matches; retrieving 2 pages
Downloaded 28 links in 24 packages.
To whose author/maintainer I give almost daily silent thank yous:
 "Spencer Graves <spencer.graves at prodsyse.com>"
Alameda, CA, USA
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