How to draw a plot joining points from two measurement times?

Question

First question here! I have two columns of data and each row are a pair of values. I want to plot the first column and the second column vertically and have a line connecting each pair of values, something that looks like this figure in the following link:

http://www.sciencedirect.com/science/article/pii/S0300957297000440#gr1

If you know how to do it, in any tools, such as R, or python, perl, excel, please let me know!

Answer 1

And another R approach using matpoints and matlines (and boxplot)

dd <- data.frame(x=rnorm(15), y= rnorm(15))

boxplot(dd, boxwex = 0.3)
# note that you need to transpose `dd`
matpoints(y= t(dd), x= c(1.17,1.83),pch=19, col='black')
matlines(y= t(dd), x= c(1.2,1.8), lty=1, col = 'black')

Answer 2

Here's an R approach with ggplot2, a bit quick and dirty:

library(ggplot2)

df <- data.frame(baseline=c(1,1,2,2,3,3,4,5,6,7,8,9,10,11),
                 sixmos  =c(5,6,5,7,8,9,10,12,12,2,1,5,2,3))

data <- data.frame(group = factor(1:nrow(df)), 
                   cat=c(rep('baseline',nrow(df)), 
                   rep('sixmos',nrow(df))), 
                   values=c(df$baseline,df$sixmos))

ggplot(data, aes(x=cat, y=values)) + 
  geom_line(aes(group=group)) + 
  geom_point(aes(group=group)) +
  geom_boxplot(data=df, aes(x='baselin', y=baseline)) + 
  geom_boxplot(data=df, aes(x='sixmos2', y=sixmos))

Also see this answer: Line charts by group