R help - Feb 2022 - How to set colors, axis gap, and free scale in ggplot?

Hello,
I have a dataframe with 3 columns: the actual measurement
(Concentration), and two groups (Vitamin and Group). I would like to
plot a barplot with superimposed a jitterplot, with error bars. I am
using facet_grid. All that I can do, but the customization does not
work. The customization is as follows:
I need to supply custom colors to the two classes of the Group column,
then have different scales for each panel and give an axis break on
the first panel.
I made a working example:
```
data("iris")
bins <- c(1.5)
iris$Group = findInterval(iris$Petal.Width, 1.5)
iris$Group = as.factor(iris$Group)
levels(iris$Group) <- c("Small", "Large")
# plot
library(ggplot2)
ggplot(iris, aes(Group, Sepal.Length, fill = Group)) +
geom_bar(position="dodge", stat="summary",
fun.y="mean") +
geom_errorbar(stat="summary", position="dodge", width=0.5) +
geom_jitter(aes(x=Group), shape=21) +
xlab(expression(bold("Plant species"))) +
ylab(expression(bold("Measure"))) +
# FROM HERE IT DOES NOT WORK
facet_grid(. ~ Species, scales="free_y") + # THE SCALE IS FIXED FOR
ALL PANELS
scale_colour_manual(values = c("palegreen4", "orangered3"))
# THE
COLORS ARE AUTOMATIC
```

I would also like to increase the size of the axis labels and the
title size of the panels.
What is the correct syntax?
Thanks

Hi Luigi

change last two ggplot commands as follows

facet_wrap(. ~ Species, scales="free_y") +
scale_fill_manual(values = c("palegreen4", "orangered3"))

Cheers
Petr
> -----Original Message-----
> From: R-help <r-help-bounces at r-project.org> On Behalf Of Luigi
Marongiu
> Sent: Tuesday, February 22, 2022 11:16 AM
> To: r-help <r-help at r-project.org>
> Subject: [R] How to set colors, axis gap, and free scale in ggplot?
> 
> Hello,
> I have a dataframe with 3 columns: the actual measurement (Concentration),
> and two groups (Vitamin and Group). I would like to plot a barplot with
> superimposed a jitterplot, with error bars. I am using facet_grid. All
that I can
> do, but the customization does not work. The customization is as follows:
> I need to supply custom colors to the two classes of the Group column,
then
> have different scales for each panel and give an axis break on the first
panel.
> I made a working example:
> ```
> data("iris")
> bins <- c(1.5)
> iris$Group = findInterval(iris$Petal.Width, 1.5) iris$Group >
as.factor(iris$Group)
> levels(iris$Group) <- c("Small", "Large") # plot
> library(ggplot2)
> ggplot(iris, aes(Group, Sepal.Length, fill = Group)) +
> geom_bar(position="dodge", stat="summary",
fun.y="mean") +
> geom_errorbar(stat="summary", position="dodge",
width=0.5) +
> geom_jitter(aes(x=Group), shape=21) + xlab(expression(bold("Plant
species")))
> +
> ylab(expression(bold("Measure"))) +
> # FROM HERE IT DOES NOT WORK
> facet_grid(. ~ Species, scales="free_y") + # THE SCALE IS FIXED
FOR ALL
PANELS
> scale_colour_manual(values = c("palegreen4",
"orangered3")) # THE COLORS
> ARE AUTOMATIC ```
> 
> I would also like to increase the size of the axis labels and the title
size of the
> panels.
> What is the correct syntax?
> Thanks
> 
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