R uses a 1-based indexing scheme (i.e., the first element of a vector has an index of 1.) This is in contrast to other languages (i.e., C++, Java, Python) in which the first element has an index of 0.
Demonstrates the usage of i.e. and period inside bracket
Most of the advanced graphing functionality in R is provided by external packages such as ggplot2, ggvis, rCharts, and rgl.
Demonstrates using ',' before 'and'.