Dear all,

I have two data frame, on with a complete list of my field survey with frequency data of a sample species. This data frame looks like:


simulation<-data.frame(cbind(my.year=c(rep(2000,8),rep(2001,12),rep(2002,12)),my.month=c(5:12,1:12,1:12)))
simulation$year.month<-paste(simulation$my.year,"_",ifelse(simulation$my.month>=10,simulation$my.month,paste("0",simulation$my.month,sep="")),sep="")
simulation$freq<-sample(1:40,32)
attach(simulation)
plot(year.month, freq)

As you can see, I have a collumn with the year and month of my samples, and a freq variable with simulated data. I would like to plot this data but when I try to use the plot showed above, I get a error message. 

After bypass this problem, I would like add points in my graph with simulated data for only a random number of survey month, but I need that the full range of surveys be kept on the X-axis. Just to simulate a sample I am using:

simulation.sample<-simulation[sample(1:length(year.month),8, replace=F),]
simulation.sample$freq<-sample(1:40,8)

Any ideas?

Kind regards

Miltinho

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