Re: [Octaviz-help] How to use the vtk_trisurf function

[LUK S. <shu...@po...>]

LUK ShunTim wrote:
> Hello,
> 
> I do not quite understand the use of the vtk_trisurf. I tried this simple 2
> triangle example - the unit square with a diagonal connecting (0,0) and (1,1).

Sorry! The diagonal should be between (1,0) and (0,1).

> The coordinates (x, y) and function values f are (columns vectors):
> 
> x=[0. 1. 0. 1.]'
> y=[0. 0. 1. 1.]'
> f=[1. 2. 3. 4.]'
> 
> and the triangulation is
> tri=[1 2 3; 2 3 4]
> 
> Now using
> vtk_trisurf(tri, x, y, f)
> 
> doesn't work. I got the error message
> 
> "error: number of rows must match (2 != 3) near line 149, column 27
> error: evaluating postfix operator `'' near line 149, column 28
> error: evaluating assignment expression near line 149, column 5
> error: called from `vtk_trisurf' in file
> `/usr/share/octave/site/m/octaviz/vtk_trisurf.m'"
> 
> I think I'm using the "4-parameter" method outlined in the online manual
> "trisurf can be called with 2(3) or 4(5) parameters as trisurf(t,[x1 y1 z1; ...;
> xn, yn, zn],(c)) or trisurf(t,[x1; ...; xn],[y1; ...; yn], [z1; ...; zn],(c))"
> 
> (It appears this is also the M**lab way to invoke trisurf according to their
> online documentation.)
> 
> I'd be grateful if someone can provide a working snippet with this simple
> example. IMHO, it'd be great if it's added to the online documentation.
> 
> Regards,
> ST
> --