[R] Secondary y axis in ggplot2: did not respond when change its y-axis value

[Marna Wagley]

Thank you Rui and Thierry for the suggestion, it helped me.
thanks


On Fri, Jan 8, 2021 at 6:58 AM Rui Barradas <ruipbarradas using sapo.pt> wrote:

> 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
>
> Às 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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