NAME¶

csagrid - cubic spline approximation

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.

SEE ALSO¶

csagrid, csa1s, csa1xs, csa2s, csa2xs, csa2ls, csa2lxs, csa3s, csa3xs, csa3ls, csa3lxs, c_csa1s, c_csa1xs, c_csa2s, c_csa2xs, c_csa2ls, c_csa2lxs, c_csa3s, c_csa3xs, c_csa3ls, c_csa3lxs.

Complete documentation for Csagrid is available at URL
http://ngwww.ucar.edu/ngdoc/ng/ngmath/csagrid/csahome.html

COPYRIGHT¶

Copyright (C) 2000
University Corporation for Atmospheric Research

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