histogram

If I understand you correctly, you already pre-computed the frequencies 
and bin widths and want to display them as a histogram. If correct, then 
what you are asking for is analogous to what bxp() is to boxplot. I am 
not sure if such a function exists.

Instead you can think of the task as drawing a bunch of rectangles 
(perhaps using symbols?). Or you can hack the hist() code and try

    br    <- c(0,20,30,40,50,60,70,80,100)
    dens  <- runif( length(br) - 1 )

    r <- structure(list(breaks = br, density = dens),
                   class = "histogram")

    plot(r, main="Felipe's Histogram")

However, I do emphasize that this is a hack. If you have the original 
data that you used to calculate the densities, consider using the breaks 
argument with hist(). It is better to use tried and tested codes.

Regards, Adai

i calculated the density and wanna do something like this

separate in 0-19-29-39-49-59-69-79-99
and put in these spaces 8 densities .. 0.something
i have the frequency in % and divided already in 20 or 10 to get the density

i tried and tried..made breaks vector to separate but couldn't put the other
vector with the frequency density onit directly

anyone know how to do it??

tks

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i calculated the density and wanna do something like this

separate in 0-19-29-39-49-59-69-79-99
and put in these spaces 8 densities .. 0.something
i have the frequency in % and divided already in 20 or 10 to get the density

i tried and tried..made breaks vector to separate but couldn't put the other
vector with the frequency density onit directly

anyone know how to do it??

Hi Felipe,
Try this:

library(plotrix)
testdat<-sample(1:100,1000,TRUE)
testfac<-cut(testdat,breaks=seq(0,100,by=10))
library(prettyR)
testdensity<-as.vector(freq(testfac,display.na=FALSE)[[1]])
barp(testdensity/1000,names.arg=names(testdensity),staxx=TRUE)

Jim