From Friedrich.Leisch@ci.tuwien.ac.at  Thu Oct  4 15:14:29 2001
From: Friedrich.Leisch@ci.tuwien.ac.at (Friedrich Leisch)
Date: Thu, 4 Oct 2001 16:14:29 +0200
Subject: [Rd] Re: RFC: package pixmap
In-Reply-To: <Pine.OSF.3.96.1011004141759.19722H-100000@ija.csic.es>
References: <15292.20438.705267.252746@galadriel.ci.tuwien.ac.at>
 <Pine.OSF.3.96.1011004141759.19722H-100000@ija.csic.es>
Message-ID: <15292.28357.893914.361853@galadriel.ci.tuwien.ac.at>


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>>>>> On Thu, 4 Oct 2001 14:29:58 +0200 (MET DST),
>>>>> Agustin Lobo (AL) wrote:

  > On Thu, 4 Oct 2001, Friedrich Leisch wrote:

[...]

  > I agree with the point that the upper left corner must be the
  > 1,1 cell in the matrix for a "natural" display of the matrix
  > as an image. But this does not mean that the matrix should be rotated.
  > In all image processing packages that I know of, an image with
  > 200 cols and 100 rows is displayed as a horizontal rectangle. Note
  > that, if there is geometric correction to a geographic projection,
  > the columns go W to E as left to right and the rows N to S as
  > top to bottom. In fact,
  > the "natural" display should follow the same geometry than print,
  > i.e.,

  >> matrix(1:12,ncol=6,nrow=2)
  >      [,1] [,2] [,3] [,4] [,5] [,6]
  > [1,]    1    3    5    7    9   11
  > [2,]    2    4    6    8   10   12
  >> 

  > should be displayed as a horizontal rectangle.

Excactly, I agree with everything you say!

you mean it doesn't do that? which version of pixmap, which version of
R on which platform?

Using 

R> x <- matrix(1:12,ncol=6,nrow=2)
R> library(pixmap)
R> plot(as.pixmap(x))

I get the attached picture, which is what you want, no?

Best,
Fritz


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[Rd] Re: RFC: package pixmap
Friedrich Leisch