On Thu, 22 Feb 2007, Serguei Kaniovski wrote:
>
> Hallo,
>
> The command:
>
> x <- 3
> mat <- as.matrix(expand.grid(rep(list(0:1), x)))
>
> generates a matrix with 2^x columns containing the binary representations
> of the decimals from 0 to (2^x-1), here from 0 to 7. But the rows are not
> sorted in this order.
>
> How can sort the rows the ascending order of the decimals they represent,
> preferably without a function which converts binaries to decimals (which I
> have)? Alternatively, generate a matrix that has the rows sorted that way?
The alternative:
mat <- as.matrix(expand.grid(rep(list(0:1), x))[ , x:1 ] )
>
> Thanks,
> Serguei
> [[alternative HTML version deleted]]
>
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Charles C. Berry (858) 534-2098
Dept of Family/Preventive Medicine
E mailto:[EMAIL PROTECTED] UC San Diego
http://biostat.ucsd.edu/~cberry/ La Jolla, San Diego 92093-0901
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