Re: Plotting 3D

[Henry F. Mollet]

Robert gives one example from the section on Three-Dimensional Plotting in
the Manual i.e. Gnuplot style, i.e. Lower lower level function style. In
this example the z-value (i.e. x=randn(25,50) is plotted using the row index
as the x-value, and column index as the y-value. The indices are counted
from zero.

The MATLAB-style three dimensional plotting commands are
Function File: mesh (x,y,z). See the sombrero.m example. First try
sombrero(25) at the octave command prompt to see the result, then open the
'sombrero.m' m-file in an editor to see what code is needed to plot the
function 
z = sin (sqrt (x^2 + y^2)) / sqrt (x^2 + y^2).
The most important step is the creation of a meshgrid for x and y using
[xx,yy] = meshgrid (x,y)
after you defined your x and y. In the sombrero.m example it is
y = y = linspace (-8,8,n), where n will be 25 if you use sombrero(25).
Henry


on 2/26/06 11:14 PM, Robert A. Macy at address@hidden wrote:

> try
> 
>>> x=randn(25,50);
>>> gsplot x;
> 
> Then use the mouse to rotate it around.
> 
>            - Robert -
> 
> On Mon, 27 Feb 2006 11:15:57 +0800
>  "tottie manuel" <address@hidden> wrote:
>> Hi!
>> 
>> I'd like to know how to plot in 3d (ie, x,y and z axes).
>> 
>> I'm using Octave 2.1.42 in Windows XP.
>> 
>> 
>> Thanks! Ö
>> 
>> 
>> -tottie-
> 
> 
> 
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