[Octaviz-help] How to use the vtk_trisurf function

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

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).
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
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