[PDF] Hadley Wickham Elegant Graphics for Data Analysis Second Edition

How to use ggplot2 in R?

As we move on to the analytics side of the R language, keep the ggplot2 package in mind for a quick way to render the analyzed data as graphics. The key is to get the data you need into a data frame and then use that data frame to visualize the data.

What is data visualization with ggplot2?

Data Visualization with ggplot2 : : CHEAT SHEET ggplot2 is based on the grammar of graphics, the idea that you can build every graph from the same components: a data set, a coordinate system, and geoms—visual marks that represent data points. Basics GRAPHICAL PRIMITIVES a + geom_blank() (Useful for expanding limits)

Does ggplot work with dplyr?

For example, ggplot2 visualizes the data that’s in a tidy dataframe. ggplot expects the input data to be in a dataframe. It doesn’t work with other data structures, for the most part. Several other packages – like dplyr – also require the input data to be in a “tidy” dataframe. All of the functions in the tidyverse packages are highly modular.

What is ggplot & qplot?

ggplot(data = mpg, aes(x = cty, y = hwy)) Begins a plot that you finish by adding layers to. Add one geom function per layer. qplot(x = cty, y = hwy, data = mpg, geom = “point") Creates a complete plot with given data, geom, and mappings. Supplies many useful defaults. last_plot() Returns the last plot