R: Create bar plot

You can use barplot function to create bar plots.  For example, following example creates bar plot for heights of students.

Height	Number Of Students
<130	5
130-135	2
136-145	4
>145	8

> heights <- table(c("<130", "<130", "<130", "<130", "<130", "130-135", "130-135", "136-145", "136-145", "136-145", "136-145", ">145", ">145", ">145", ">145", ">145",">145",">145", ">145" ))
> 
> barplot(heights)

Above statements, draws barplot like following.

You can draw same bar plot using ggplot2 also.

> x <- c("<130", "130-135", "136-145", ">145")
> y <- c(5, 2, 4, 8)
> qplot(x, y, geom="bar", stat="identity")

Above snippet draws bar plot like following.

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