Plotting problem with 2.9.x, but not 2.1.7x (was: Problem with mesh command)

[Matthias Brennwald]

Dear all,

I just went back from Octave 2.9.9 (from HPC) to Octave 2.1.72 (from  
Fink), and the below issue with 3D-plotting vanished. Who knows what  
changed with the (3D) plotting routines from 2.1.7x to 2.9.x?

Cheers,
Matthias


On 08.11.2006, at 07:11, I wrote:

> Message: 6
> Date: Tue, 7 Nov 2006 22:15:31 +0100
> From: Matthias Brennwald <address@hidden>
> Subject: Problem with mesh command
> To: address@hidden
> Message-ID: <address@hidden>
> Content-Type: text/plain; charset=ISO-8859-1; delsp=yes; format=flowed
>
> Dear all,
>
> I have a few problems with the 'mesh' command in Octave 2.9.9 (binary
> form HPC) running on Mac OS X (I use gnuplot 4.0 with Apple's X11 for
> plotting). Consider the following code:
>
> *****************************
>
> x = [1:10];
> y = [1:20];
>
> [X,Y] = meshgrid(x,y); Z = - X;
> subplot(3,1,1)
> mesh(Z)
> __gnuplot_raw__ ("set logscale x;\n");
> replot
>
> subplot(3,1,2)
> mesh(x,y,Z)
> __gnuplot_raw__ ("set logscale x;\n");
> replot
>
> subplot(3,1,3)
> mesh(X,Y,Z)
> __gnuplot_raw__ ("set logscale x;\n");
> replot
>
> *****************************
>
> I'd expect three identical plots from this, with the x axis scaled
> logarithmically. However, the x axis is NOT scaled logarithmically.
> Even worse, plot 1 looks like what I'd expect (Z values range from -1
> to -10), whereas the plots 2 and 3 are completely wrong (Z values
> range from 0 to 20 or so, and there's an oscilation in the y
> direction). Also, plots 2 and 3 look similar to each other. Still
> worse is that if I run the code a second time, plot 2 now looks
> similar to plot 1 (Z ranging from -1 to -10), but plot 3 still shows
> Z values from 0 to 20 with the oscillation in the y direction.
>
> What's going on here?
>
> Cheers,
> Matthias




-------
Matthias Brennwald
Lägernstrasse 6
CH 8037 Zürich
+41 (0)44 364 17 03
address@hidden