David,
Do these work for you? (I am resending this so others can see. The original
only went to you.)
library(lubridate)
a<-c(4, 5, 6)
b<-c("18:00", "18:01", "18:02")
c<-as.data.frame(cbind(a,b))
c$d<-hm(c$b)
c$d$minute[2]
I could do it manually like this (where FrHour is fractional hour)
a<-c(4, 5, 6)
b<-c("18:00", "18:09", "18:42")
c<-as.data.frame(cbind(a,b))
c$d<-hm(c$b)
c$d$minute[2]
c$Hour=as.numeric(substr(c$b,1,2))
c$Second=as.numeric(substr(c$b,4,5))
c$FrHour <- c$Hour + c$Second/60
As I was writing Rui posted another option with code for graphing.
Tim
-----Original Message-----
From: R-help <r-help-boun...@r-project.org> On Behalf Of Parkhurst, David
Sent: Sunday, September 18, 2022 4:27 PM
To: r-help@r-project.org
Subject: [R] Need help plotting
[External Email]
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.
[[alternative HTML version deleted]]
______________________________________________
R-help@r-project.org mailing list -- To UNSUBSCRIBE and more, see
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.
