Re: TRIGRID co-linearity problem

[Christopher Davey <davey(at)cira.colostate.edu>]

Roman,

I went ahead and tried doing what you recommended, using the randomu or
randomn functions to add random parts to my latitude and longitude
arrays. But I am still getting a co-linear error from trigrid. Are you
somehow determining specifically which x (longitude) and y (latitude)
points are co-linear and then adding the random perturbations to these
points only?

Roman Schreiber wrote:

> I had a similar problem few weeks ago. Without going into details
> I tried a "brute force" approach adding to x and y geographical
> coordinates small random parts (about 0.0001 * coordinate value).
> Error disappeared and the resulting contour plot was OK.
> But it does not of course explain the reason for the peculiar
> behavior of trigrid procedure...
>
> Christopher Davey wrote:
> >
> > The triangulation( ) procedure works just fine, but In my call to
> > trigrid( ), I get an error that I cannot figure out: "Points are
> > co-linear, no solution."
>
> Regards
>
> Roman Schreiber
>
> schreibe@ncac.torun.pl