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: fr...@aims.ac.za
https://sites.google.com/a/aims.ac.za/fredo/
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