# [R] force axis to extend

Jim Lemon drjimlemon at gmail.com
Thu Mar 16 03:09:09 CET 2017

```Hi Jen,
It seems way too simple, but does this work?

axis(side=2,at=seq(-35,35,by=5),cex.axis=0.7)

You may want to consider using a pyramid plot for this.

Jim

On Thu, Mar 16, 2017 at 11:45 AM, Jen <plessthanpointohfive at gmail.com> wrote:
> Hi,  I'm creating a couple of mirrored bar plots.  Below is data and code
> for one.
>
> My problem is that I need the axis to go from -35 to 35 by 5.  I can't get
> that to happen with the code below.  I need it so all my plots are on the
> same scale.
>
> How can I do that using barplot? For reasons, I can't use ggplot or
> lattice.
>
> Thanks,
>
> Jen
>
>
>
> df <- data.frame(matrix(c(
> '18-29',        'Females',      23.221039,
> '30-44',        'Females',      16.665565,
> '45-59',        'Females',      7.173238,
> '60+',  'Females',      4.275979,
> '18-29',        'Males',        -22.008875,
> '30-44',        'Males',        -15.592936,
> '45-59',        'Males',        -7.312195,
> '60+',  'Males',        -3.750173),
> nrow=8, ncol=3, byrow=T,
> dimnames=list(NULL, c("Age", "Sex", "Percent"))))
>
> df\$Percent <- as.numeric(as.character(df\$Percent))
>
> midf <- barplot(height = df\$Percent[df\$Sex == "Females"])
>
> # distribution of men and women with solid fill
>
> plot(c(0,5),range(df\$Percent),type = "n", axes=FALSE, ann=F)
>
> barplot(height = df\$Percent[df\$Sex == "Females"], add = TRUE,axes = FALSE,
> col="#b498ec", ylab="")
>
> barplot(height = df\$Percent[df\$Sex == "Males"], add = TRUE, axes = F,
> col="#f8bb85", ylab="",
>         names.arg=c("18-29", "30-44", "45-59", "60+"))
>
> axis(side=2, at = seq(-35,35,by=5),
>      labels=format(abs(seq(-35,35,by=5)), scientific=F),
>      cex.axis=0.7)
>
>         [[alternative HTML version deleted]]
>
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