try this:
n <- 3
data.frame(Exp = seq_len(n),
Heads = rbinom(n, 200, 0.5))
I hope it helps.
Best,
Dimitris
On 10/13/2010 7:28 PM, Shiv wrote:
I am trying a simple toin coss simulation, of say 200 coin tosses. The idea
is to have a data frame like so:
Experiment# Number_Of_Heads
1 104
2 96
3 101
So I do:
d<-data.frame(exp_num=c(1,2,3)); /* Just 3 experiments to begin with */
d$head_ct<-sum(sample(0:1,200,repl=TRUE));
d;
exp_num head_ct
1 1 85
2 2 85
3 3 85 /* the same scalar value is
applied to all the rows */
So I tried using "within", and "for", and making the "sum( " as a
function, and I end up with the same...I get the same constant value. But
what I want of course is different "samples"....
--
Dimitris Rizopoulos
Assistant Professor
Department of Biostatistics
Erasmus University Medical Center
Address: PO Box 2040, 3000 CA Rotterdam, the Netherlands
Tel: +31/(0)10/7043478
Fax: +31/(0)10/7043014
Web: http://www.erasmusmc.nl/biostatistiek/
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