PGFPlots draws high--quality function plots in normal or logarithmic scaling with a user-friendly interface directly in TeX. The user supplies axis labels, legend entries and the plot coordinates for one or more plots and PGFPlots applies axis scaling, computes any logarithms and axis ticks and draws the plots. IXL Math . Gain fluency and confidence in math! IXL helps students master essential skills at their own pace through fun and interactive questions, built in support, and motivating awards. This post explains how to build a bubble chart with R and ggplot2. It provides several reproducible examples with explanation and R code. A bubble plot is a scatterplot where a third dimension is added: the value of an additional numeric variable is represented through the size of the dots. (source: data-to-viz ). So not only is a less than ideal plot type being used here, it’s being made to do a lot more work than usual, and with the wrong sort of color palette. As is often the case with pie charts, the compromise made to facilitate interpretation is to display all of the numerical values for every wedge, and also to add a summary outside the pie.