在x轴上绘制矩阵的所有列

Question

I would like to plot all the columns of a matrix separately on the x-axis with the y-axis being the values in the columns of the matrix. To illustrate what I'm looking for when I create the matrix:

test=matrix(c(1,4,3,2,3),ncol=5,nrow=5)

and plot it using

boxplot(test)

each boxplot of the columns of the matrix appears separately on the x-axis. What I want is this exactly except for just dots going up the y-axis instead of the boxplot.

Answer 1

Not that it makes much sense to have data laid out this way, but here it is:

test=matrix(c(1,4,3,2,3),ncol=5,nrow=5)
plot(rep(1:5, 5), c(t(test)))

Answer 2

using reshape2 library to melt data

library(reshape2)

test = matrix(c(1, 4, 3, 2, 3), ncol = 5, nrow = 5)

plot(melt(test)[, 2:3])

Answer 3

boxplot has a plot argument:

plot
if TRUE (the default) then a boxplot is produced. If not, the summaries which the boxplots are based on are returned.

The results you are interested in are in the stats component.

You could then use matpoints or matplot(..., type = 'p')

Note that you must transpose the results to get your desired plot

matpoints(t(boxplot(test, plot = FALSE)$stats), pch = 19, col = 'black')