Re: [R] Matrix barplot

From: Nutter, Benjamin <NutterB_at_ccf.org>
Date: Fri, 25 Jul 2008 08:26:36 -0400

> data <- data.frame(Year=c(2000,2001,2002),

                     A=c(4,2,1), 
                     B=c(3,1,2), 
                     C=c(0,3,5))

> data.mat <- as.matrix(data)[,2:4]
> rownames(data.mat) <- data$Year
> data.mat <- t(data.mat)
> barplot(data.mat,beside=TRUE)

-----Original Message-----
From: r-help-bounces_at_r-project.org [mailto:r-help-bounces_at_r-project.org] On Behalf Of Andreas Tille
Sent: Friday, July 25, 2008 8:14 AM
To: r-help_at_r-project.org
Subject: [R] Matrix barplot

Hi,

as a bloody R beginner I failed to solve the probably simple problem to create a barplot of the following data read from a file

      Year      A     B    C
      2000      4     3    0
      2001      2     1    3
      2002      1     2    5

The Barplot should look like

     5 |                 C
     4 |   A             C
     3 |   AB      C     C
     2 |   AB    A C    BC
     1 |   AB    ABC   ABC
       +------------------
          2000  2001  2002

(well, something like that - the colors are encoded as letters in this   ASCII-graphics - assume the coloring / shading as usual).

My problem is that if I read the table using

    data <- read.table(file='data.dat', sep = '\t', fill=TRUE, header=TRUE )

everything looks is read as expected if I try

    data

but I have no idea how to separate the Matrix (A B C) to specify the height parameter of barplot as a matrix and the names.arg parameter for the inscription. Whatever I tried I get

    'height' must be a vector or a matrix

and I have no idea to do this right. So I think I'm just facing a data conversion problem and have to turn data[['Year']] into a vector and the remaining table into a matrix.

I guess this is a really simple question - but I failed to find a solution.

Kind regards

        Andreas.

-- 
http://fam-tille.de

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Received on Fri 25 Jul 2008 - 12:40:14 GMT

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