Hei,
i am trying to plot the means of two variables (d13C and d15N), by 2
grouping factors (Species and Year) that i obtained by the function tapply.
I would like to plot with different colours according to the Year and show
the "Species" as data labels.
My data looks like this:
Species d13C d13N Year
"Species1" 14,4 11.5 2009
"Species2" ... ... ....
>Nmean<-tapply(d15N,list(Year,Species),mean)
>Cmean<-tapply(d13C,list(Year,Species),mean)
##works fine, returns something like this
Species1 Species2 Species3
2009 20.3 13.4 13,5
2011 NA 23.5 14.5
2012 11.3 NA 23.4
>plot(Cmean,Nmean,col=c("green","red","blue"),....)
#works fine, gives a plot with data points coloured by "Year"
>text(Cmean,Nmean,labels=levels(Species),cex=.7,adj=c(-.1,-.6))
#does not work, mixes up the labels, have tried Species<-as.factor(Species)
and switched tapply(d15N,list(Year,Species),mean)
to-->tapply(d15N,list(Species,Year),mean) which gives the Years as column
names but does not produce a better plot. The
I cannot find the error, any idea what i am doing wrong????
Thanks sooo much
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