[R] plot level, velocity, acceleration with one x axis

[Eric Berger]

How about this:

a <- cbind(AirPassengers, diff(log(AirPassengers)),
diff(diff(log(AirPassengers))))
colnames(a)[2:3] <- c("percent increase", "acceleration")
plot(a, xlab="year", main="AirPassengers")

HTH,
Eric


On Mon, May 29, 2023 at 7:57 AM Spencer Graves
<spencer.graves using effectivedefense.org> wrote:
>
> Hello, All:
>
>
>           I want to plot level, velocity, and acceleration in three panels with
> only one x axis.  The code below does this using "layout".  However, I
> want the three plot areas to be of equal size, and this won't do that:
> If I stretch the plot vertically, the relative sizes of the three panels
> changes.  There's probably a way to do this with ggplot2, but I have yet
> to find it.
>
>
>           Suggestions?
>           Thanks,
>           Spencer Graves
>
>
> str(AirTime <- as.numeric(time(AirPassengers)))
> str(AP <- as.numeric(AirPassengers))
>
> def.par <- par(no.readonly = TRUE) # save default, for resetting...
> (mat3x1 <- matrix(1:3, 3))
> plot3x1 <- layout(mat3x1, heights=c(1.4, 1, 1.5))
> layout.show(plot3x1)
>
> par(mar=c(0, 4.1, 4.1, 2.1))
> plot(AirTime, AP, log='y', type='l', axes=FALSE,
>       main='AirPassengers', ylab='AirPassengers')
> box(col='grey')
> axis(2, las=1)
>
> par(mar=c(0, 4.1, 0, 2.1))
> vAP <- diff(log(AP))
> plot(tail(AirTime, -1), vAP, type='l',
>       ylab='percent increase', axes=FALSE)
> box(col='grey')
> axis(2, las=1)
>
> par(mar=c(5.1, 4.1, 0, 2.1))
> plot(tail(AirTime, -2), diff(vAP), type='l',
>       ylab='acceleration', xlab='year',
>       las=1)
> box(col='grey')
>
> par(def.par)
>
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