How to draw a line chart include 2 or more lines?

[Humphrey Zhao]

In my analysis, I gathered a serial data about the number of post during 6 years. I separated 6 years with 24 seasons and gain the table in the document "pdp.csv".

I want to draw a line chart use ggplot2 with "Period" as x axis, and "NoPX" as y axis(just like the line chart in the CSV). However, no matter how hard I have tried, I can draw 1 line in the graph only. When I add other column using "line" or "geom_line", an error will occur and that line won't add on the graph. May I ask how can I draw all lines on the graph? Thanks a lot. 

 

[Ben Bond-Lamberty]

The best, though not only, way to do this is to reshape your data
frame into 'long' format first:

d <- read.csv("pdp.csv")
library(reshape2)
dmelted <- melt(d, id.vars=1)

This produces a data frame with columns Period, variable, and value. Then simply

library(ggplot2)
ggplot(dmelted,aes(Period,value,color=variable))+geom_line()

Ben

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