Provided by: libncarg-dev_6.3.0-6build1_amd64

**NAME**

SHGRID - interpolate random data in 3-space using a modified Shepard's algorithm

**SYNOPSIS**

CALL SHGRID (N, X, Y, Z, F, NXO, NYO, NZO, XO, YO, ZO, FF, IWK, RWK, IER)

**DESCRIPTION**

N (integer,input) The number of input data points (N > 9). X (real, input) An array containing the X coordinates of the input data points. X is dimensioned for N. Y (real, input) An array containing the Y coordinates of the input data points. Y is dimensioned for N. Z (real, input) An array containing the Z coordinates of the input data points. Z is dimensioned for N. F (real, input) Array dimensioned for N containing data values. F(I) is a functional value at (X(I),Y(I),Z(I)) for I = 1 to N. NXO (integer, input) The number of X coordinate values in the output grid. NYO (integer, input) The number of Y coordinate values in the output grid. NZO (integer, input) The number of Z coordinate values in the output grid. XO (real, input) An array dimensioned for NXO containing the X coordinates of the output surface. YO (real, input) An array dimensioned for NYO containing the Y coordinates of the output surface. ZO (real, input) An array dimensioned for NZO containing the Y coordinates of the output surface. FF (real, output) An array dimensioned for NXO x NYO x NZO containing the calculated function values for the output function. FF(I,J,K) is the calculated functional value at (XO(I), YO(J), ZO(K)) for I=1,NXO and J=1,NYO and K=1,NZO. IRK (integer, input) An integer workspace of length at least 2*N. RWK (real, input) A work array dimensioned for 11*N+6. 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**

SHGRID is called to interpolate randomly spaced data in 3-space. SHGRID uses a modified Shepard's algorithm to construct an interpolatory surface.

**ACCESS**

To use SHGRID, load the NCAR Graphics library ngmath.

**SEE** **ALSO**

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

**COPYRIGHT**

Copyright (C) 2000 University Corporation for Atmospheric Research The use of this Software is governed by a License Agreement.