[R] Histogram

[Marc Schwartz]

On Wed, 2006-09-27 at 18:29 -0400, Mohsen Jafarikia wrote:
> Dear all,
> 
> I want to design a histogram and I need to have the frequency at certain
> points. For example I have the following 2 columns:
> 
> *X      Y*
> 
> 0.1    25
> 0.4    22
> 0.45  11
> 0.55  21
> 
> I want the chart to have 4 columns. First column is from 0.0-0.1 (on X) and
> frequency is 25. Next colum is wider and form 0.1-0.4 with 22 frequency.
> Next column is narrow with 11 frequency and the last column is the same as
> the first one with 21 frequency.
> 
> Can anybody tell me how I can have this chart.
> 
> Thanks,
> Mohsen

How about this:

X <- c(0, 0.1, 0.4, 0.45, 0.55)
Y <- c(25, 22, 11, 21)

barplot(Y, space = 0, width = diff(X))
axis(1)

See ?barplot and ?diff

HTH,

Marc Schwartz