From help-request at octave dot org Tue Jan  4 11:09:25 2005
Subject: Re: Plotting many images on one figure
From: Etienne Grossmann <etienne at cs dot uky dot edu>
To: Daniel =?iso-8859-1?Q?D=E9chelotte?= <boite_a_spam at club-internet dot fr>
Cc: help at octave dot org, etienne@cs.uky.edu
Date: Tue, 4 Jan 2005 12:05:17 -0500



  Salut Daniel,

what about a 280x280 image?

foo = zeros(10*siz);
for  i = 1:100
  m = floor((i-1)/10);
  n = rem(i-1,10);
  foo(m*siz+[1:sz],n*siz+[1:sz]) = reshape(everything(i,:), siz, siz)';
end
image(foo);

  Hth,

  Etienne

On Tue, Jan 04, 2005 at 04:40:09PM +0100, Daniel Déchelotte wrote:
# Hi,
# 
# I would like to draw, say, a 10 by 10 grid of images, each of which is a 28
# by 28 pixel, gray-level image. I couldn't get imshow() or image() to
# display anything, I could only get saveimage generate a ppm image (PS seems
# broken), and I can not see how I could arrange several of these images into
# one figure.
# 
# Below:
#  "siz" is 28
#  "everything" is a [N, siz * siz] array (N = 100)
# The following statement writes the first image in a ppm file:
#  saveimage("test.ppm", reshape(everything(1,:), siz, siz)',...
#            "ppm", colormap(gray(256)))
# 
# A Matlab(r) script I would like to port to octave:
# nlines = 10;
# ncolumns = 10;
# for i=1:nlines * ncolumns,
#   subplot(nlines, ncolumns, i);
#   colormap(gray(256));
#   image(reshape(everything(i,:), siz, siz)');
# end
# 
# I am afraid I already know the answer (not possible), but I wouldn't like
# to miss a solution if one exists. I am running octave2.0.17-8 but could be
# using octave2.1.60-1 if that helps, on Linux (Debian sarge).
# 
# Regards,
# -- 
# Daniel Déchelotte
#                   http://yo.dan.free.fr/
# 
# 
# 
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-- 
Etienne Grossmann ------ http://www.cs.uky.edu/~etienne



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