Hi,

I don't quite understand what you want. But perhaps, you would like to 
try this

hist(datobs)
lines(density(datobs))

and get some ideas

Best,
Ruihong

On 05/07/2010 02:42 AM, Roslina Zakaria wrote:
> Hi r-users,
>   
> I would like to overlap a smooth line on the histogram.  I tried using spline but it does not work.
>
> sq<- seq(0,900,by=50)
> sq.50<- as.character(sq)
> datobs<- sum_pos
> ## first, plot histogram
> histo<- hist(datobs,breaks=sq,freq=F)
> ## extract counts from histogram and calculate the probability in
> ## each specified interval. Also check the length of the interval is
> ## the same with the length of the fitted model.
> hct<- c(0,histo$counts)/length(datobs)
> ## use barplot and lines to overlap the observed and fitted data
>
>    
>> y<- pdf_formula.2*50
>>      
>   [1] 0.000000e+00 2.422196e-01 2.445114e-01 1.826918e-01 1.236800e-01 7.965830e-02 4.978001e-02 3.048459e-02 1.839873e-02
> [10] 1.098342e-02 6.500920e-03 3.821499e-03 2.233833e-03 1.299656e-03 7.531443e-04 4.349116e-04 2.494558e-04 1.365303e-04
> [19] 6.142313e-05
>   
> barplot.x.location<-
> barplot(hct, ylim=c(0,0.25),col="yellowgreen",
> main="Observed data and fitted gamma sum",
> xlab="Rainfall (mm)", ylab="Relative frequency",
> names.arg = sq.50, axisnames = TRUE, axis.lty=1,
> cex.axis= 0.8,cex.names= 0.8, xaxs='i', yaxs='i')
> lines(x = barplot.x.location, y = pdf_formula.2*50,
>         col = "red", pch = 7, lwd=3, cex.axis= 0.7)
>   
> Thank you for any help given.
>
>
>
>
>
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>
>    
>
>
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