[R] plotting a point graph with data in X-axis

[jim holtman]

You have to have a valid 'date' object on the x-axis.  Try this:

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)
# create POSIXct time
simulation$time <- ISOdate(simulation$my.year, simulation$my.month,1)
attach(simulation)
plot(time, freq)


On 5/8/07, Milton Cezar Ribeiro <milton_ruser at yahoo.com.br> wrote:
> 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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-- 
Jim Holtman
Cincinnati, OH
+1 513 646 9390

What is the problem you are trying to solve?