[Rd] a bug of function plot (PR#4405)

[Roger D. Peng]

I cannot reproduce this bug on either Linux or Windows XP Home.  The 
given function plots the lines correctly.

Also, CRAN keeps all old versions of the sources, so if you wanted to 
run an older version of R you could probably build it from source.

-roger

xzhao at stat.wvu.edu wrote:
> Full_Name: Ximing Zhao
> Version: R 1.7.1
> OS: MacOs X
> Submission from: (NULL) (64.136.27.51)
> 
> 
> When I used function plot in R 1.7.1, I found two bugs.
> My whole function is this:
> *****************
> drawexp<-function(X,x,c,b){
> exp<-function28(X,x,c,b)
> if(max(exp)>=max(dexp(x,rate=1))){
> plot(x,exp, type="l",main= paste("Exponential ,n=",length(X),"
> c=",round(c,2),"b=",b),sub="X=exp(rate=1)")
> lines(x,dexp(x,rate=1),col="red",type="l") 
> lines(density(X,width="SJ-dpi",n=1000,from=0.1,to=4),lty=2,col="blue")
> }
> else{
> plot(x,dexp(x,rate=1),col="red",type="l",main= paste("Exponential
> ,n=",length(X)," c=",round(c,2),"b=",b),sub="X=exp(rate=1)")
> lines(x,exp, type="l")
> lines(density(X,width="SJ-dpi",n=1000,from=0.1,to=4),lty=2,col="blue")
> }
> text(3,0.35,"-- theoretical",col="red",adj=c(0,0))
> text(3,0.3,"-- moment type", adj=c(0,0))
> text(3,0.25, "-- Kernel type", col="blue", adj=c(0,0))
> }
> 
> function28<-function(X,x,c,b){
> est<-function(X,x,alfa){
> fx<-(1/gamma(alfa))*((alfa-1)/x)*(alfa*X/x)^(alfa-1)*exp(-alfa*X/x)
> fx
> }
> n<-length(X)
> result<-colSums(sapply(x,function(x){est(X,x,alfa=(n^c)*log(n)^b)}))/length(X)
> result
> }
> 
> X1<-rexp(100)
> 
> x1<-seq(0.1,4,length=100)
> 
> Run the function like this:
> 
> drawexp(X1,x1,0,0.5)
> 
> ***************
> 
> For "lines(density(X,width="SJ-dpi",n=1000,from=0.1,to=4),lty=2,col="blue")",
> only lty=1 works, lty=2 and others don't work. I tried the function in 1.6.2
> before,
> it was alright. So I am positive it's a bug. Please check.
> 
> Another thing is, if X11 window for the graph is not big enough, and the text,
> like "-- moment type" in the function floats out, then X11 window doesn't show
> the text at all. If you use the function in 1.6.2, it will show part of it but
> not the characters beyond the graph size. I don't think it's reasonable to not
> show anything. So it should be another bug.
> 
> I have a few suggestions, please keep the version which has been tested for a
> long
> time and with few bugs on the website(for different operating system), so
> whenever people need some old good version they can still download from CRAN.
> Also, please do not update the version of R in such a hurry way and let such
> mistakes happen so easily. If you do update the version and want to introduce to
> people, please mark it as "beta" so people will know. I understand this is a
> free software and it's pretty hard to manage, but such efforts will be greatly
> appreciated.
> 
> If you have any question w/ the bugs I described, please email me and I'd like
> to 
> help.
> 
> Thank you very much!
> 
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