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Setting x and y Scales

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``````# Load Packages -----------------------------------------------------------

library(tidyverse)

# Import Data -------------------------------------------------------------

penguin_bill_length_by_island <-
penguins |>
drop_na(bill_length_mm) |>
group_by(island) |>
summarize(mean_bill_length = mean(bill_length_mm))

# Setting x and y Scales --------------------------------------------------

# Adjusting our x and y axes is similar.
# Remember that the x and y axes are considered an aesthetic properties
# in the same way color and fill are.

# We adjust our x and y axes using the scale_ set of functions.
# The exact function you use depends on your data.
# For example, you would use scale_y_continuous()
# if you have continuous data on the y axis.

# The limits argument sets the minimum and maximum values that display.

ggplot(data = penguin_bill_length_by_island,
mapping = aes(x = island,
y = mean_bill_length,
fill = island)) +
geom_col() +
scale_y_continuous(limits = c(0, 50))

# The breaks argument determines which axis labels show up.

ggplot(data = penguin_bill_length_by_island,
mapping = aes(x = island,
y = mean_bill_length,
fill = island)) +
geom_col() +
scale_y_continuous(limits = c(0, 50),
breaks = c(0, 5, 10, 15, 20, 25, 30, 35, 40, 45, 50))

# If we want to change the x axis labels, we'd need to use
# the labels argument in scale_x_discrete() because that data is categorical.

ggplot(data = penguin_bill_length_by_island,
mapping = aes(x = island,
y = mean_bill_length,
fill = island)) +
geom_col() +
scale_y_continuous(limits = c(0, 50),
breaks = c(0, 5, 10, 15, 20, 25, 30, 35, 40, 45, 50)) +
scale_x_discrete(labels = c("Biscoe Island",
"Dream Island",
"Torgersen Island"))``````

``````# Load Packages -----------------------------------------------------------

library(tidyverse)

# Import Data -------------------------------------------------------------

# Setting x and y Scales --------------------------------------------------

# Copy the code for the last bar chart you made
# Update it so that the y axis goes from 0 to 200

# Copy the code you just wrote
# Update it so that it has breaks on the y axis at 0, 40, 80, 120, and 160

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Maria Montenegro

Hello! What does the c mean in the functions? example: limits= c(0,50). Wondering if it stands for something specific that can help me remember why it goes there, it doesn't seem intuitive to me.

I am also wondering if there is a way to edit breaks that is more efficient than entering the values one by one. Is there a way to specify what in excel is called the axis' units?

David Keyes Founder

The `c()` function combines multiple values. I think of it as "combine" in my head (though I'm not sure that's what its developers would actually call it). In this case, it means combine 0 and 50 so that 0 is the low value and 50 is the high value. Does that help?