This article presents how to easily highlight a ggplot using the **gghighlight** package.

Contents:

## Prerequisites

Load required packages and set the default ggplot2 theme to `theme_bw()`

.

```
library(tidyverse)
library(gghighlight)
theme_set(theme_bw())
```

## Line plot

- Basic line plot

```
p <- ggplot(
airquality,
aes(Day, Temp, group = Month, color = factor(Month))
) +
geom_line() +
scale_color_viridis_d() +
labs(x = "Day of Month", y = "Temperature") +
theme(legend.position = "top")
p
```

- Highlight the lines whose max values are larger than 93 like below:

`p + gghighlight(max(Temp) > 93, label_key = Month)`

## Histogram

```
ggplot(iris, aes(Sepal.Length, fill = Species)) +
geom_histogram(bins = 30) +
scale_fill_viridis_d() +
gghighlight() +
facet_wrap(~ Species)
```

## Scatter plot

```
df <- mtcars %>% mutate(name = row.names(.))
df %>%
ggplot(aes(mpg, disp)) +
geom_point(col = "darkred") +
gghighlight(disp > 350 & disp <= 400,
unhighlighted_colour = alpha("steelblue", 0.4),
use_direct_label = TRUE,
label_key = name,
label_params = list(size = 5)) +
geom_point(col = "darkred", size = 2.5)
```

## Bar plot

```
ggplot(df, aes(name, mpg)) +
geom_col() +
theme(axis.text.x = element_text(angle = 45, hjust = 1)) +
gghighlight(mpg > 25)
```

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I would like to realize a boxplot analysis with ggpubr library but I didn’t arrive to do it. In effect I have some questions to address you:

What is the adequate format to export the phenotyping data (excel, csv, test)?

is there a script appropriate to vizualise the phenotyping data for this library?

would he be possible to give the script to someaone?

Hi,

Here are the steps for creating a box plot:

1. Organize your data as follow:

2. Prepare your data as described at: Data preparation best practices

3. Save your data into csv format

4. Import the data into R (http://www.sthda.com/english/wiki/reading-data-from-txt-csv-files-r-base-functions):

5. Create the box plot:

If it does not work, send me a sample of your data by e-mail at contact@datanovia.com