These functions implement cubic smoothing splines and also provide some basic
computations for radial basis functions. All are called using the `.FORTRAN`

interface.

For these low level FORTRAN subroutines refer to the R functions for the calling sequence and to the src subdirectory of the fields pacakage for the source code.

- css
Cubic smoothing spline see

`sreg`

and`splint`

- ddfind
Finds nearest neighbor points within a fixed distance. See

`fields.rdist.near`

- dmaket
Creates matrix of all polynomial terms up to fixed order. See

`fields.mkpoly`

- evlpoly
evaluates a univariate polynomial. See codefields.evlpoly

- evlpoly2
evaluates a multivariate polynomial. See codefields.evlpoly2

- inpoly
Determine which 2-d locations are within a polynomial. see

`in.poly`

- igpoly
Determine which 2-d grid points locations are within a polynomial. see

`in.poly.grid`

- multeb
Multiply an exponential cross covariance matrix by another matrix. See

`exp.cov`

- multrb
Multiply an radial basis function matrix by another matrix. See

`rad.cov`

- radbas
Evaluates radial basis functions. See

`rdist.R`

- rcss
Robust cubic smoothing spline. See

`qsreg`

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