On 06/11/2012 11:47 AM, analys...@hotmail.com wrote:
I have a data set whose rows look like
Item date variable_1 variable_2 variable_3 variable_4
Different items may occur over different dates.
During any single study, I might select a subset of the four variables
or some function of them to be plotted against time (date).
For each item, I would select a date range and I want a plot of the
selected variables over that range for that item.
I need a method that would do this at one shot and put the plot
objects out to disk, one for each item.
Hi analyst41,
You probably want to write a custom function something like this:
plot_varying<-function(x,which_vars=3:6,which_item=NA,
start_date,end_date) {
# open an output device with an unique name
png(paste(which_item,format(start_date,"%d%m%Y"),
format(end_date,"%d%m%Y"),".png",sep="_")
# get the plot dimensions
ylim<-range(x[x$item==which_item,which_vars[1]])
# plot all the requested variables
matplot(x[x$item==which_item,which_vars],ylim=ylim,...)
dev.off()
}
Then call your function for each item, variables and dates.
Jim
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