On 8/9/06, John McHenry <[EMAIL PROTECTED]> wrote: > Hi WizaRds, > > In MATLAB you can do > > x=1:10 > > and then specify > > x(2:end) > > to get > > 2 3 4 5 6 7 8 9 10 >
In R you could do the above via: x[-1] > or whatever (note that in MATLAB the parenthetic index notation is used, not > brackets as in R). The point is that 'end' allows you to refer to the final > index point of the array. > > Obviously there isn't much gain in syntax when the variable name is x, but > when it's something like > > hereIsABigVariableName(j:end-i) > > it makes things a lot more readable than > > hereIsABigVariableName(j:length(hereIsABigVariableName)-i) > > In R I could do: > > n<- length(hereIsABigVariableName) > hereIsABigVariableName[j:n-i] In "R version 2.4.0 Under development (unstable) (2006-08-08 r38825)" available from CRAN, head and tail can have negative arguments: head(x, -2) is the same as x[1:8] using your x. > > but I'd like to use something like 'end', if it exists. > > Am I missing something obvious in R that does what 'end' does in MATLAB? > > Thanks, > > Jack. > > > --------------------------------- > > [[alternative HTML version deleted]] > > ______________________________________________ > R-help@stat.math.ethz.ch 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@stat.math.ethz.ch 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.
