which 6 cells do you want? do you want one from each column? You could use expand.grid:
> x <- expand.grid(1:8, 1:8, 1:8, 1:8, 1:8, 1:8) > str(x) 'data.frame': 262144 obs. of 6 variables: $ Var1: int 1 2 3 4 5 6 7 8 1 2 ... $ Var2: int 1 1 1 1 1 1 1 1 2 2 ... $ Var3: int 1 1 1 1 1 1 1 1 1 1 ... $ Var4: int 1 1 1 1 1 1 1 1 1 1 ... $ Var5: int 1 1 1 1 1 1 1 1 1 1 ... $ Var6: int 1 1 1 1 1 1 1 1 1 1 ... - attr(*, "out.attrs")=List of 2 ..$ dim : int 8 8 8 8 8 8 ..$ dimnames:List of 6 .. ..$ Var1: chr "Var1=1" "Var1=2" "Var1=3" "Var1=4" ... .. ..$ Var2: chr "Var2=1" "Var2=2" "Var2=3" "Var2=4" ... .. ..$ Var3: chr "Var3=1" "Var3=2" "Var3=3" "Var3=4" ... .. ..$ Var4: chr "Var4=1" "Var4=2" "Var4=3" "Var4=4" ... .. ..$ Var5: chr "Var5=1" "Var5=2" "Var5=3" "Var5=4" ... .. ..$ Var6: chr "Var6=1" "Var6=2" "Var6=3" "Var6=4" ... > head(x) Var1 Var2 Var3 Var4 Var5 Var6 1 1 1 1 1 1 1 2 2 1 1 1 1 1 3 3 1 1 1 1 1 4 4 1 1 1 1 1 5 5 1 1 1 1 1 6 6 1 1 1 1 1 On Wed, Dec 22, 2010 at 1:19 PM, Ron Michael <ron_michae...@yahoo.com> wrote: > Let say, I have a matrix with 8 rows and 6 columns: > >> df1 <- matrix(NA, 8, 4) >> df1 > [,1] [,2] [,3] [,4] > [1,] NA NA NA NA > [2,] NA NA NA NA > [3,] NA NA NA NA > [4,] NA NA NA NA > [5,] NA NA NA NA > [6,] NA NA NA NA > [7,] NA NA NA NA > [8,] NA NA NA NA > > Now I want to get **all possible** ways to fetch 6 cells at a time. Is there > any function to do that? > > Thanks, > > > [[alternative HTML version deleted]] > > > ______________________________________________ > 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. > > -- Jim Holtman Data Munger Guru What is the problem that you are trying to solve? ______________________________________________ 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.
