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

Gabor Grothendieck ggrothendieck at gmail.com
Wed May 9 02:39:40 CEST 2007

- use proper spacing to make it easier to read
- start off with set.seed to make it reproducible
- omit cbind and combine all the rep's into one rep in first line
- make the date column a known date class (here "Date"),

sim <- data.frame(
   my.year = rep(2000:2002, c(8, 12, 12)),
   my.month = c(5:12, 1:12, 1:12),
   freq = sample(1:40, 32)
sim$date <- as.Date(paste(sim$my.year, sim$my.month, 1, sep = "-"))
plot(freq ~ date, sim)

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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