DESCRIPTION

Csagrid is a software package in the ngmath library that implements a cubic spline approximation algorithm to fit a function to input data. The input for the approximation is a set of randomly-spaced data. These data may be one-dimensional, two-dimensional, or three-dimensional.

The output is a set of values at coordinates on a user-specified grid, or at a set of user-specified points (including at a single point).

Functionally equivalent Fortran, C, and NCL interfaces are provided.

Csagrid is based on the work of David Fulker and his package Splpack.

SYNOPSIS

Fortran one-dimensional input
-----------------------------

 CSA1S        -  simple entry

 CSA1XS       - expanded entry

Fortran two-dimensional input
-----------------------------

 CSA2S        - simple entry, gridded output

 CSA2XS       - expanded entry, gridded output

 CSA2LS       - simple entry, list output

 CSA2LXS      - expanded entry, list output

Fortran three-dimensional input
-----------------------------

 CSA3S        - simple entry, gridded output

 CSA3XS       - expanded entry, gridded output

 CSA3LS       - simple entry, list output

 CSA3LXS      - expanded entry, list output

C one-dimensional input
-----------------------------

 c_csa1s        -  simple entry

 c_csa1xs       - expanded entry

C two-dimensional input
-----------------------------

 c_csa2s        - simple entry, gridded output

 c_csa2xs       - expanded entry, gridded output

 c_csa2ls       - simple entry, list output

 c_csa2lxs      - expanded entry, list output

C three-dimensional input
-----------------------------

 c_csa3s        - simple entry, gridded output

 c_csa3xs       - expanded entry, gridded output

 c_csa3ls       - simple entry, list output

 c_csa3lxs      - expanded entry, list output

NCL one-dimensional input
-----------------------------

 csa1s        -  simple entry

 csa1xs       - expanded entry

NCL two-dimensional input
-----------------------------

 csa2s        - simple entry, gridded output

 csa2xs       - expanded entry, gridded output

 csa2ls       - simple entry, list output

 csa2lxs      - expanded entry, list output

NCL three-dimensional input
-----------------------------

 csa3s        - simple entry, gridded output

 csa3xs       - expanded entry, gridded output

 csa3ls       - simple entry, list output

 csa3lxs      - expanded entry, list output

ACCESS

To use Csagrid entries, load the NCAR Graphics library ngmath.

COPYRIGHT

Copyright (C) 2000
University Corporation for Atmospheric Research

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