1nnalg(1NCARG)                    NCAR GRAPHICS                   nnalg(1NCARG)
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NAME

6       nnalg - a tool for displaying features of the Natgrid algorithm
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SYNOPSIS

9       nnalg algorithmic_data_file
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DESCRIPTION

12       "nnalg" takes a single argument which is a the name of a special file
13       created by the Fortran subroutine NATGRIDS or the C function c_natgrids
14       in the Natgrid package. This file contains data appropriate for
15       displaying various features of the Natgrid algorithm. By default, this
16       file is not created. In order to create it, you need to set the
17       parameter adf in the Natgrid package.  You can additionally override
18       the default file name of "nnalg.dat" by using the parameter alg.
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20       To invoke "nnalg", simply type the command:
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22       nnalg data_file
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24       By editing the data file, you have many options as to what is displayed
25       and what the appearance of the plot looks like.
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27       The features that can be displayed are:
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29         1. The input data points
30         2. The natural neighbor circumcircles
31         3. The Delaunay triangulation, derived from the natural
32            neighbor circumcircles
33         4. The Voronoi polygons
34         5. The first order natural neighbors of a given
35            input point (or points)
36         6. The second order natural neighbors of a given input
37            point (or points)
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39       The first four items in the above list are displayed in the default
40       case.
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USAGE

43       What gets displayed by nnalg depends on values in the input data file
44       which can be changed by manual editing.
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SEE ALSO

47       natgrid
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49       Complete documentation for nnalg is available at URL
50       http://ngwww.ucar.edu/ngdoc/ng/ngmath/natgrid/algorithm.html
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53       Copyright (C) 2000
54       University Corporation for Atmospheric Research
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56       The use of this Software is governed by a License Agreement.
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60UNIX                            March 1997-1998                  nnalg(1NCARG)
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