El lun, 05-03-2007 a las 22:16 -0800, Dylan Arena escribió:
> So here is my question in a nutshell:
> Does anyone have ideas for how I might efficiently process a matrix
> like that returned by a call to combinations(n, r, rep=TRUE) to
> determine the number of repetitions of each element in each
Dylan Arena wrote:
>
> I'm writing a function that calculates the probability of different
> outcomes of dice rolls (e.g., the sum of the highest three rolls of
> five six-sided dice).
>
You know there are simpler ways to do this, don't you?
Alberto Monteiro
sorry, i forgot to mention that you will need an extra test |-)
tmp <- combinations(3, 3, rep=TRUE)
out <- colSums(apply(tmp, 1, duplicated))+1
out[out == 1] <- 0
but now, re-reading your message, you say
"(..) want to count the number of times each element appears in each
arrangement (...)
is this what you mean?
tmp <- combinations(3, 3, rep=TRUE)
colSums(apply(tmp, 1, duplicated))+1
b
On Mar 6, 2007, at 1:16 AM, Dylan Arena wrote:
> Hi there,
>
>
> I'm writing a function that calculates the probability of different
> outcomes of dice rolls (e.g., the sum of the highest three rol
Hi there,
I'm writing a function that calculates the probability of different
outcomes of dice rolls (e.g., the sum of the highest three rolls of
five six-sided dice). I'm using the "combinations" function from the
"gtools" package, which is great: it gives me a matrix with all of the
possible c
