R学习（带数字的分枝为已学内容）
R学习.png
复制R学习中看到的图表代码，在RStudio上复现柱形图
# Create the input vectors.
colors <- c("green","orange","brown")
months <- c("Mar","Apr","May","Jun","Jul")
regions <- c("East","West","North")
# Create the matrix of the values.
Values <- matrix(c(2,9,3,11,9,4,8,7,3,12,5,2,8,10,11),nrow = 3,ncol = 5,byrow = TRUE)
# Create the bar chart.
barplot(Values,main = "total revenue",names.arg = months,xlab = "month",ylab = "revenue", col = colors)
# Add the legend to the chart.
legend("topleft", regions, cex = 1.1, fill = colors)
代码出处：
https://www.w3cschool.cn/r/r_bar_charts.html
20210203-01_total-revenue.png
