I?ve been retired since ?06 and have forgotten most of R. Now I have a use for it, with some data from Bloomington?s Environmental Commission.
I have a dataframe (obtained from read.csv) that contains numerous columns, including time (in Excel?s 18:00 format), and DNO2, and MNO2 from two air quality instruments.
I?d like a plot of both the NO2 measurements against time. I be happy to use either ordinary R plots or ggplot2 ones, if that would be a better way. I?d much appreciate help.