## quantmod package: stock performance graph 

install.packages("quantmod")   # "quantmod" package is installed
library("quantmod")            # "quantmod" package is loaded (quotes " " not really needed)
getSymbols("MSFT")             # Microsoft data is obtained
barChart(MSFT)                 # Microsoft data is presented as a barchart

## For details, see: https://cran.r-project.org/package=quantmod 

getSymbols("AAPL")             # Apple data is obtained
barChart(AAPL)                 # Apple data is presented as a barchart