Re: Plotting problem

[Etienne Grossmann]

Methodological note: I didn't know a thing of 

    set style data filledcurves y1=0

5 minutes ago. I just started gnuplot, typed 'help fill' and followed
from there.

  Good hacking,

  Etienne

On Tue, May 02, 2006 at 10:39:05AM -0400, Etienne Grossmann wrote:
# 
#   Hi Matthias,
# 
# shing like
# 
#   xx = linspace (-7,7,100); 
#   y1 = sin (xx); y2 = 0.8*sin(xx+pi/6); y3 = 0.64*sin(xx+pi/3);
#   __gnuplot_raw__ ("set style data filledcurves y1=0;\n")
#   plot (xx,y1,xx,y2,xx,y3)
# 
# ?
# 
#   Hth,
# 
#   Etienne
# 
# On Tue, May 02, 2006 at 03:25:33PM +0200, Matthias Brennwald wrote:
# # Dear all,
# # 
# # before reading further, a short warning: I'm a newbie (both with  
# # Octave and with this list), so...
# # 
# # I am trying to write some code that plots a "waterfall diagram" (aka.  
# # "cumulative spectral decay diagram", CSD diagram). An example of such  
# # plot is available here: http://www.euronet.nl/users/temagm/audio/ 
# # waterfall_focal.htm
# # 
# # I want this code to work both under Matlab and Octave. I use Octave  
# # 2.1.72 on the Mac, but the code should not be limited to this  
# # specific setup.
# # 
# # My approach to plotting the waterfall is this (see also example code  
# # below): first, plot the curve in the back as a filled polygon. Then,  
# # plot the next curve also as filled polygon above the one in the back;  
# # and continue in the same way until the frontmost curve. With Matlab,  
# # I can use 'fill3' easily plot these polygons. With plain vanilla  
# # Octave, the only options I have is 'mesh' or '__gnuplot_splot__',  
# # which I cannot make plot FILLED polygons. (I also tried the 'fill3'  
# # command from Octave-forge, but with no luck. Also, I want my code to  
# # be independent of Octave-forge, because Octave-forge is not available  
# # as a 'stable' version from Fink for easy installation on the Mac.)
# # 
# # Any help or ideas?
# # 
# # Matthias
# # 
# # 
# # 
# # 
# # An example illustrating my approach (and problem) is this:
# # 
# # **********************
# # % First, make up three curves z(x) to play with. Each of the curves  
# # have constant y (y=1,2,3):
# # x = [0:100];
# # y = [ 0:2 ];
# # z = [   2+sin(x/10);
# #          1.8 + 0.8*sin(x/11);
# #          1.5 + 0.6*sin(x/12); ];
# # 
# # % append some points so we get closed curves:
# # x = [ x x(end) x(1) x(1) ];
# # z = [ z [0 0 0]' [0 0 0]' z(:,1) ];
# # 
# # for n=1:3
# #      if exist('OCTAVE_VERSION') % we're running Octave
# #          mesh(x,y(n),z(n,:)); % this plot TRANSPARENT polygons
# #      else % we're running Matlab
# #          poly=fill3(x,repmat(y(n),1,length(z(n,:))),z(n,:),'w'); %  
# # this plots a filled polygon with fill color 'white'
# #          set(poly,'EdgeColor','r'); % this sets the edge of the  
# # polygon to 'red'
# #      end
# #      hold on
# # end
# # 
# # hold off
# # **********************
# # 
# # 
# # 
# # 
# # -------
# # Matthias Brennwald
# # Lägernstrasse 6
# # CH 8037 Zürich
# # +41 (0)44 364 17 03
# # address@hidden
# # 
# # 
# # 
# # _______________________________________________
# # Help-octave mailing list
# # address@hidden
# # https://www.cae.wisc.edu/mailman/listinfo/help-octave
# 
# -- 
# Etienne Grossmann ------ http://www.cs.uky.edu/~etienne

-- 
Etienne Grossmann ------ http://www.cs.uky.edu/~etienne