[R] abline function : plot.new has not been called yet

[Jeff Newmiller]

The abline function is part of base graphics (read the help ?abline... it is part of the "graphics" package).

The xyplot function is part of the lattice package... a clone of the original "trellis" package from the S software. The two approaches to graphics don't play well together.

Once you know to keep this distinction in mind, you can probably find examples on the web, such as [1], or in help files such as ?panel.abline.

[1] http://apcg.uoregon.edu/GeogR/topics/lattice.htm
 
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On December 13, 2014 11:05:52 PM PST, Frederic Ntirenganya <ntfredo at gmail.com> wrote:
>Hi All,
>
>I would like to have an idea of how I can solve this error.
>
>I am getting the following error in plotting:
>
>> abline(regn,col='red',lwd=1.5 , data=BUTemp)
>Error in int_abline(a = a, b = b, h = h, v = v, untf = untf, ...) :
>  plot.new has not been called yet
>
>This is the str of my data set
>
>> str(BUTemp)
>'data.frame':    7671 obs. of  6 variables:
> $ Year : int  1971 1971 1971 1971 1971 1971 1971 1971 1971 1971 ...
>$ Month: Factor w/ 12 levels "Aug","Sep","Oct",..: 2 2 2 2 2 2 2 2 2 2
>...
> $ Day  : int  1 2 3 4 5 6 7 8 9 10 ...
> $ Rain : num  0 0 0 0 0 0 0 0 0 0 ...
> $ Tmax : num  24.3 25 25.6 26.5 27.8 27.5 25.7 25.1 26.5 25.1 ...
> $ Tmin : num  13.5 13.2 12.7 12.7 12.2 14 13.2 12.3 12.8 11.7 ...
>
>The code I am using is :
>
>require(latticeExtra) # trellis plot for temperature and rain.
>require(lattice)
>
>levels(BUTemp$Month) <- c("Aug", "Sep", "Oct", "Nov", "Dec", "Jan",
>                          "Feb", "Mar", "Apr", "May", "Jun", "Jul")
>
>xyplot(BUTemp$Tmin + BUTemp$Tmax ~ BUTemp$Year | BUTemp$Month,
>       data =BUTemp , type = "b", pch=19)
>
>regn=lm(BUTemp$Tmin + BUTemp$Tmax ~ BUTemp$Year)
>
>abline(regn,col='red',lwd=1.5)
>summary(regn)
>
>Thanks  for your help.
>
>Regards,
>Frederic.
>Frederic Ntirenganya
>Maseno University,
>African Maths Initiative,
>Kenya.
>Mobile:(+254)718492836
>Email: fredo at aims.ac.za
>https://sites.google.com/a/aims.ac.za/fredo/
>
>	[[alternative HTML version deleted]]
>
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