[R] Random number generation

[Max]

Marc,

this is very handy. My next question is, do you know a quick and easy 
way to transfer all of the output to a txt file? (or .xls)?

Thanks,

-Max


Marc Schwartz explained on 07/31/2008 :
> 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
>
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