ansaurus

Question

Answer 1

A:

if the values are integer and simply you want to count up them, how about

barplot(table(rbinom(10000, 20000, 0.0001)))

kohske 2010-08-16 08:03:56

that's good for some cases, but sometimes you'd really want the values to be binned together

David B 2010-08-16 11:36:48

Answer 2

+1 A:

In such a case I usually use:

 hist(rbinom(1000,2000,0.0001),breaks=function(x) length(unique(x)))

mbq 2010-08-16 08:58:51

+1 thanks, that solves the first part. any suggestions on how to make the x labels centered?

David B 2010-08-16 11:36:14

@David Try rcs's solution.

mbq 2010-08-17 19:33:23

Answer 3

+1 A:

Here is a way to center the labels:

x <- rbinom(1000, 2000, 0.001)
tmp <- hist(x, breaks=0:(max(x)+1), xaxt="n", right=FALSE, freq=FALSE)
axis(1, at=tmp$mids, labels=0:max(x))

rcs 2010-08-16 13:00:20

+1 nice and simple, although the `breaks=0:(max(x)+1)` is not generic enough (in some cases you would like binning and not a bar for each int)

David B 2010-08-18 07:43:54

This was just an example, it could be easily replaced by an appropriate `seq` statement.

rcs 2010-08-18 07:54:32

Answer 4

A:

Also:

x <- rbinom(10000, 20000, 0.0001)
hist(x, br = seq(-0.01, max(x)+1, 1), freq=F, col="black")

(the col="black" is not necessary, of course, I just find it more readeable in black!)

nico 2010-08-16 13:30:55

adjusting x-axis in R histograms