gf_vline()

gf_vline()

The gf_vline() function will add a vertical line onto a plot. You can plot the line by referencing a value in a data frame (Example 1), or by specifying the point along the axis where the line should run through (Example 2).

Example 1:

# Save the mean into a data frame using favstats()
Thumb_stats <- favstats(~Thumb, data = Fingers)

# Plot the mean on a histogram with a vertical line
gf_histogram(~Thumb, data = Fingers) %>%
     gf_vline( xintercept = ~mean , data = Thumb_stats , color = "blue" , size = 2)

Example of output from running the code above:
Histogram of Thumb in the Fingers data frame, A vertical line is plotted through the mean near 60

Example 2:

# Plot the mean of 60.1 on a histogram with a vertical line
gf_histogram(~Thumb, data = Fingers) %>%
     gf_vline( xintercept = 60.1, color = "blue" , size = 2)

Example of output from running the code above:
Histogram of Thumb in the Fingers data frame, A vertical line is plotted through the mean near 60​

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