on 07/31/2008 12:24 PM Max wrote:
Hi Everyone,
I did a quick search of the list and it looks like this may not have
been asked before... I'm trying to generate a matrix of random numbers
between 0 and 1, with 6 columns, 10000 rows. About all I know is that
runif(1) gives me the random number I'm looking for.
Any help would be great!
thanks,
MAT <- matrix(runif(10000 * 6), 10000, 6)
> str(MAT)
num [1:10000, 1:6] 0.753 0.600 0.806 0.713 0.796 ...
> head(MAT, 10)
[,1] [,2] [,3] [,4] [,5] [,6]
[1,] 0.75343430 0.4993896 0.68554749 0.01924549 0.90579982 0.99606191
[2,] 0.59957219 0.4075650 0.57851744 0.97208426 0.32137505 0.02089689
[3,] 0.80567935 0.5746030 0.16520072 0.92615138 0.01628994 0.90075333
[4,] 0.71270574 0.3252210 0.53765089 0.58930899 0.03053356 0.23282879
[5,] 0.79603691 0.5591622 0.97308348 0.52744458 0.76403708 0.22268021
[6,] 0.49624259 0.5106604 0.06687444 0.48659150 0.29803454 0.91760758
[7,] 0.32921909 0.7784539 0.20468873 0.86730697 0.42581735 0.59344279
[8,] 0.93646405 0.4819996 0.79033546 0.68441917 0.28566573 0.97244395
[9,] 0.02964297 0.5489500 0.64355067 0.87131530 0.58505804 0.06972828
[10,] 0.55956266 0.8376349 0.11850374 0.37687892 0.71220844 0.97784727
The first argument to runif() is how many random deviates you want to
generate. If you need to be able to reproduce the exact sequence again
in the future, see ?set.seed.
HTH,
Marc Schwartz
______________________________________________
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.
