... don't know if this will help, but grid graphics, which is the graphics engine for both trellis and ggplot, has a basic arrow() function. Trellis's provides an interface to it with the panel.arrows() panel function. I suspect ggplot has something similar, but as I don't use it, I don't know for sure.
There is also an arrows() function in the basic (non-grid) graphics engine, but this is probably irrelevant for your needs. Cheers, Bert Bert Gunter "Data is not information. Information is not knowledge. And knowledge is certainly not wisdom." -- Clifford Stoll On Tue, Aug 11, 2015 at 7:16 AM, John Kane <jrkrid...@inbox.com> wrote: > Hi, > Good example and data. Thanks. > > Here are a couple of approaches that may help. > I tend to use a lot of what I tend to think of as the ggplot family of > associated so you may need to install a couple packages. I used lubridate to > transform your character dates to POSIXct. Jeff N's code does exatly the > same in base R. so you don't really need the lubridate package. > > I changed the data set name to dat1 and transformed the column names to > lower case just for my convenience. Data is now in dput() form. See ?dput() > for more information. It is the preferred way to share data on R-help > > Given what appears to be vastly different y-scales for rainfall and wind > direction it struck me that it might be better to have the data in two plots > so I included that option. > > I am not really sure how to get the arrows you want. You may be able to do it > using scale_shape_manual but I am not sure if the required symbols are > available. > > You may have to manually draw them. See > http://stackoverflow.com/questions/3421331/example-needed-using-arrow-with-ggplot2 > for how to draw an arrow. > > John Kane > Kingston ON Canada > ##============Start code============== > library(ggplot2) > library(reshape2) > library(lubridate) > library(gridExtra) > > dat1 <- structure(list(deal1 = c("10/22/2012 0:00", "10/22/2012 0:15", > "10/22/2012 0:30", "10/22/2012 0:45", "10/22/2012 1:00", "10/22/2012 1:15" > ), rainfall_cm = c(0L, 0L, 0L, 0L, 0L, 0L), wind_direction1 = c(296L, > 317L, 323L, 323L, 326L, 326L), wind_direction2 = c("W", "NW", > "NW", "NW", "NW", "NW")), .Names = c("deal1", "rainfall_cm", > "wind_direction1", "wind_direction2"), class = "data.frame", row.names = c(NA, > -6L)) > > > dat1$deal1 <- mdy_hm(dat1$deal1) # Lazy man's equivalent of Jeff N's > Sandy$Deal1 <- as.POSIXct( Sandy$Deal1, format="%m/%d/%Y %H:%M") > > dat2 <- melt(dat1[ , 1:3], id.var = "deal1") # use reshape to rearrange > data. > p <- ggplot(dat2, aes(deal1, value, colour = variable) )+ geom_point() > p > > ## possible option > g1 <- ggplot(dat1, aes(deal1, wind_direction1)) + geom_point() + > theme(axis.title.x=element_blank()) > g2 <- ggplot(dat1, aes(deal1, rainfall_cm ) )+ geom_point() > > grid.arrange( g1, g2, ncol=1) > > ##===========end code================== > > >> -----Original Message----- >> From: rhel...@gmail.com >> Sent: Mon, 10 Aug 2015 00:05:27 -0400 >> To: r-help@r-project.org >> Subject: [R] Plotting wind direction as arrows with precipitation >> >> Hello R users! >> >> I am trying to create a time series in R with two variables, >> precipitation >> and wind direction vs Date/Time. >> >> I am looking for suggestions and maybe even sample code. >> >> My workbook is called "Sandy" and has columns with Date/Time, >> Raindall_cm, >> Wind Direction in both degree format (0-359) and in character form (N, >> NW, >> S, SW, SE, E, NE, NW). >> >> I have done some reading for it on stackoverflow and other sites but not >> making head way. >> >> I will be graphing with ggplot most likely and am a beginner in R, self >> taught from books and online resources. >> >> This is the code I have and a small peak into the data. >> >> Sandy<-read.csv("Sandy.csv", header=TRUE, sep=",",stringsAsFactors=FALSE) >>> head(Sandy) >> Deal1 Rainfall_cm Wind_Direction1 Wind_Direction2 >> 1 10/22/2012 0:00 0 296 W >> 2 10/22/2012 0:15 0 317 NW >> 3 10/22/2012 0:30 0 323 NW >> 4 10/22/2012 0:45 0 323 NW >> 5 10/22/2012 1:00 0 326 NW >> 6 10/22/2012 1:15 0 326 NW >> >>> class(Sandy) >> [1] "data.frame" >> >>> str(Sandy) >> 'data.frame': 1832 obs. of 4 variables: >> $ Deal1 : chr "10/22/2012 0:00" "10/22/2012 0:15" "10/22/2012 >> 0:30" "10/22/2012 0:45" ... >> $ Rainfall_cm : num 0 0 0 0 0 0 0 0 0 0 ... >> >> $ Wind_Direction: num 296 317 323 323 326 326 >> >> $ Wind_Direction: chr "W" "NW" "NW" "NW" ... >> >>> require(ggplot2) >> Loading required package: ggplot2 >> >> # this graph does the precipitation vs time graph, but not the wind >> >>> ggplot(Sandy, aes(x = Deal1, y = Rainfall_cm, group = 1)) + >> geom_line(stat = "identity") >> >> >> Ideally I want it to have the precipitation graph vs time, then wind vs >> time on the same graph. I would like the wind direction to be arrows >> pointing in the designated direction (i.e. North points north). >> >> Thank you! >> >> [[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. > > ____________________________________________________________ > FREE 3D MARINE AQUARIUM SCREENSAVER - Watch dolphins, sharks & orcas on your > desktop! > > ______________________________________________ > 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. ______________________________________________ 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.
