Marna Wagley
2021-Jan-08 01:01 UTC
[R] Secondary y axis in ggplot2: did not respond when change its y-axis value
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))
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Rui Barradas
2021-Jan-08 14:58 UTC
[R] Secondary y axis in ggplot2: did not respond when change its y-axis value
Hello,
What about the following?
First get the min and max of value by variable == "y1".
Then use that range to scale up "y2".
rng <- tapply(daT1$value, daT1$variable, range)$y1
ggplot(data = daT1, aes(x = x, group = variable, color = variable)) +
geom_line(data = subset(daT1, variable == "y1"),
aes(y = value)) +
geom_line(data = subset(daT1, variable == "y2"),
aes(y = value*diff(rng) + rng[1])) +
facet_wrap(~group) +
scale_y_continuous(sec.axis = sec_axis(~ .*0.0001))
Hope this helps,
Rui Barradas
?s 01:01 de 08/01/21, Marna Wagley escreveu:> 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]]
>
> ______________________________________________
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> 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.
>
Thierry Onkelinx
2021-Jan-08 15:20 UTC
[R] Secondary y axis in ggplot2: did not respond when change its y-axis value
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.onkelinx at 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.wagley at 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 at 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]]