ncl_csagrid man page

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.


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


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


NCAR GRAPHICS January 1999