The second y-axis in ggplot2 is only intended to relabel an axis with a fixed transformation. E.g. one axis in degree Celcius and one in Kelvin, km and miles, ... It does not rescale the variables.
It looks like you want to display two variables with unrelated units on the same y-axis. That is not a good idea. https://blog.datawrapper.de/dualaxis/ ir. Thierry Onkelinx Statisticus / Statistician Vlaamse Overheid / Government of Flanders INSTITUUT VOOR NATUUR- EN BOSONDERZOEK / RESEARCH INSTITUTE FOR NATURE AND FOREST Team Biometrie & Kwaliteitszorg / Team Biometrics & Quality Assurance thierry.onkel...@inbo.be Havenlaan 88 bus 73, 1000 Brussel www.inbo.be /////////////////////////////////////////////////////////////////////////////////////////// To call in the statistician after the experiment is done may be no more than asking him to perform a post-mortem examination: he may be able to say what the experiment died of. ~ Sir Ronald Aylmer Fisher The plural of anecdote is not data. ~ Roger Brinner The combination of some data and an aching desire for an answer does not ensure that a reasonable answer can be extracted from a given body of data. ~ John Tukey /////////////////////////////////////////////////////////////////////////////////////////// <https://www.inbo.be> Op vr 8 jan. 2021 om 02:02 schreef Marna Wagley <marna.wag...@gmail.com>: > Hi R users, > I was trying to plot a graph with a secondary axis, and used the following > code for the data but the secondary line and secondary y -axis value did > not match. I would like to show both lines in one graph. > > Any suggestions? > > library(ggplot2) > library(reshape2) > daT<-structure(list(x = c(1L, 2L, 3L, 4L, 5L, 6L, 7L, 8L, 1L, 2L, > 3L, 4L, 5L, 6L, 7L, 8L), y1 = c(9754L, 1051L, 5833L, 5769L, 2479L, > 470L, 5828L, 174L, 2045L, 6099L, 8780L, 8732L, 4053L, 9419L, > 4728L, 3587L), y2 = c(0.51, 0.61, 0.3, 0.81, 0.89, 0, 1.9, 0.76, > 0.87, 0.29, 0, 0.42, 0.73, 0.96, 0.62, 0.06), group = c("A", > "A", "A", "A", "A", "A", "A", "A", "B", "B", "B", "B", "B", "B", > "B", "B")), class = "data.frame", row.names = c(NA, -16L)) > print(daT) > daT1<-melt(daT, id.vars=c("x", "group")) > daT1%>% > ggplot() + > geom_line(aes(x = x, y = value, group = variable, color = variable)) + > facet_wrap(~group) + > scale_y_continuous(sec.axis = sec_axis(~ .*0.0001)) > > [[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. > [[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.
