I've tried various commands. ?plot, Teetor's book, "R Cookbook", and Mittal's book, "R Graphs Cookbook" without seeing how to write the command to create scatterplots from my data.frame. The structure is:
str(chemdata)
'data.frame': 14886 obs. of 4 variables: $ site : Factor w/ 148 levels "BC-0.5","BC-1",..: 104 145 126 115 114 128 124 2 3 3 ... $ sampdate: Date, format: "1996-12-27" "1996-08-22" ... $ param : Factor w/ 8 levels "As","Ca","Cl",..: 1 1 1 1 1 1 1 1 1 1 ... $ quant : num 0.06 0.01 0.01 0.01 0.01 0.01 0.01 0.01 0.01 0.01 ... and what I'd like to do is create scatter plots of quant (y-axis) against the factor site (x-axis) for specified param factors. Teetor has an example for a data set with two numeric variables and a single factor. I have a single numeric veriable, two factors, and a date. I'll also want to create time series line plots of values as a function of date for specified params. If the data.frame had only two columns all the examples work. But, using two columns (the number per site factor for only a specified param factor) is not covered in what I've read so far. Other graphing resources about which I should know? Rich ______________________________________________ R-help@r-project.org mailing list https://stat.ethz.ch/mailman/listinfo/r-help PLEASE do read the posting guide http://www.R-project.org/posting-guide.html and provide commented, minimal, self-contained, reproducible code.
