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Re: What is 'iadj' and 'iend' in TRIANGULATION? [message #62817 is a reply to message #62751] Fri, 03 October 2008 06:33 Go to previous message
Spon is currently offline  Spon
Messages: 178
Registered: September 2007
Senior Member
On Oct 1, 3:14 pm, "Karlo Janos" <idl.20.beam...@spamgourmet.com>
wrote:
> Hello all!
>
> I'd like to use IDL's function TRIANGULATION for determining the
> nearest neighbor on the surface of a sphere. Unfortunately the keyword
> 'CONNECTIVITY' doesn't work together with 'SPHERE'. But I found in the
> struct of SPHERE the fields 'iadj' and 'iend'. What do they mean? I did
> not find any explanation about this struct.
> Best regards
>
> Karlo

Hi Karlo,

The output of the SPHERE keyword is designed to be passed to the
TRIGRID function. The TRIANGULATE helpfile states that 'The structure
contains the 3D Cartesian locations sample points and the adjacency
list that describes the triangulation.', so I'm guessing .iadj
and .iend are fields that contain information about the adjacency
list. Have a look at Example 2 in the TRIGRID helpfile.

If you want to find out what the arrays in these structure fields
actually _mean_, then I'm afraid I'm no use to you! :-/

Regards,
Chris

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