[R] multiple bases to decimal (was: comparing two matrices)

From: Adrian Dusa <dusa.adrian_at_gmail.com>
Date: Sun 21 Jan 2007 - 12:39:33 GMT

Hi again,

I was contemplating the solution using base 3: set.seed(3)
mat2 <- matrix(sample(0:2, 15, replace=T), 5, 3)

Extracting the line numbers is simple:
bases <- c(3, 3, 3)^(2:0) # or just 3^(2:0) colSums(apply(mat2, 1, function(x) x*bases)) + 1 [1] 7 23 25 8 1

The problem is sometimes the columns have different number of levels, as in: mat1 <- expand.grid(0:2, 0:2, 0:1)[,3:1]

Is there any chance to combine different bases in order to obtain the corresponding line numbers?
I thought of something like:
bases <- c(3, 3, 2)^(2:0)

but it doesn't work (sigh).

Thanks for any hint,
Adrian

-- 
Adrian Dusa
Romanian Social Data Archive
1, Schitu Magureanu Bd
050025 Bucharest sector 5
Romania
Tel./Fax: +40 21 3126618 \
          +40 21 3120210 / int.101

______________________________________________
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.
Received on Sun Jan 21 23:45:39 2007

Archive maintained by Robert King, hosted by the discipline of statistics at the University of Newcastle, Australia.
Archive generated by hypermail 2.1.8, at Sun 21 Jan 2007 - 15:30:22 GMT.

Mailing list information is available at https://stat.ethz.ch/mailman/listinfo/r-help. Please read the posting guide before posting to the list.