[Rd] plot with Julian date (PR#9145)

[cspark at ces.clemson.edu]

Full_Name: Chanseok Park
Version: 2.3.1
OS: RHEL
Submission from: (NULL) (130.127.112.89)


Dear Sir/Madam:

I wrote some examples below. 
The plot() function is not working properly with Julian date. 
For example, log="" should be a default option, but without the repetition of
this default option in plot(), we can not draw it especially with Julian date. 
So, maybe, the plot() function might not be compatible with as.date(). 

Thanks,
C. Park

##############################################
library(survival)

dat=c("12-5-1995", "12-30-1995", "8-27-1996", "11-20-1996", "8-29-1997" )

miles = c(106, 1468, 7298, 7935, 13440 )

jdat = as.date(dat)

 plot( jdat, miles )   ## Not working

 plot( jdat, miles, log="" )  ## Works

 plot( jdat, miles, type="l") ## Not working

 plot( jdat, miles, log="", type="l") ## works with WARNING

##===========================
## Let's use as.Date() and as.date().
jdat = as.Date( as.date(dat) )

 plot( jdat, miles )          ## Works
 plot( jdat, miles, log="" )  ## Works
 plot( jdat, miles, type="l") ## WOrks