Provided by: libncarg-dev_6.1.2-7_amd64 bug

NAME
       SHGETNP - find the nearest points to a specified point in 3-space.


SYNOPSIS
       CALL SHGETNP (PX, PY, PZ, N, X, Y, Z, IFLAG, IWK, RWK, NP, IER)


DESCRIPTION
       PX          (real,input) The X coordinate value for a point P whose nearest neighbor is to be found.

       PY          (real,input) The Y coordinate value for a point P whose nearest neighbor is to be found.

       PZ          (real,input) The Z coordinate value for a point P whose nearest neighbor is to be found.

       X           (real, input) An array containing the X coordinates of the input data points.

       Y           (real, input) An array containing the Y coordinates of the input data points.

       Z           (real, input) An array containing the Z coordinates of the input data points.

       IFLAG       (integer,  input)  A  flag that equals 0 if this is the first call to this subroutine for the
                   given dataset and equals 1 otherwise.

       IRK         (integer, input) An integer workspace dimensioned for at least 2*N.

       RWK         (real, input) A real workspace dimensioned for at least 11*N+6.

       NP          (integer, output) An index such that (X(NP),Y(NP),Z(NP)) is the nearest input data  point  to
                   P. NP = 0 if IER .NE. 0. On successive calls to this subroutine after the first (that is when
                   IFLAG=1) you can find the Mth closest point to (PX,PY,PZ) with the  Mth  call.  IWK  and  RWK
                   should not be modified between calls to SHGETNP if you are wanting to find successive nearest
                   neighbors.

       IER         (integer, output) An error return value.  If IER is  returned  as  0,  then  no  errors  were
                   detected. If IER is non-zero, then refer to the man page for shgrid_errors for details.


USAGE
       SHGETNP is called to find the nearest point to a specified point in 3-space.  Successive calls to SHGETNP
       will determine the point nearest the specified point exclusive of the points  found  in  previous  calls,
       i.e.  successive  calls  can  be  used to find the N nearest points for any N between one and the maximum
       number of points in the input dataset.


ACCESS
       To use SHGETNP, load the NCAR Graphics library ngmath.


SEE ALSO
       shgrid, shseti, shgeti, shgrid_params.

       Complete documentation for Shgrid is available at URL
       http://ngwww.ucar.edu/ngdoc/ng/ngmath/shgrid/shhome.html


COPYRIGHT
       Copyright (C) 1997-2000
       University Corporation for Atmospheric Research

       The use of this Software is governed by a License Agreement.