Plotting multiple lines from a data frame in R

Question

I am building an R function to plot a few lines from a data table, I don\'t understand why this is not working?

data = read.table(path, header=TRUE);
plot(da         


        

Answer 1

Have a look at the ggplot2 package

library(ggplot2)
library(reshape)
data <- data.frame(time = seq(0, 23), noob = rnorm(24), plus = runif(24), extra = rpois(24, lambda = 1))
Molten <- melt(data, id.vars = "time")
ggplot(Molten, aes(x = time, y = value, colour = variable)) + geom_line()

Answer 2

You don't need to load any package of for or apply, just simply use the matplot function built in R... Each column of a table will be a line in your graph (or symbols if you prefer).

Answer 3

Or with base:

data <- data.frame(time = seq(0, 23), noob = rnorm(24), plus = runif(24), extra = rpois(24, lambda = 1))
plot(extra ~ time, 
  data = data, 
  type = "l", 
  ylim = c(min(data[ ,-1]), max(data[ ,-1])),
  ylab = "value")
lines(data$time, data$plus, col = "steelblue")
lines(data$time, data$noob, col = "pink")