Splines

Explanation of tables
*green Function exists in octave 2.0.x
Noted incompatibilities and missing features
+yellow Function exists in matcompat
Author and home for the function.
?orange Function doesn't exist
Explanation of what you can do instead.
xred Function doesn't exist, and no work-around

Piece-wise polynomial operations
xfnval
xfnbrk
xfncmb
xfn2fm
xfnder
xfnint
xfnjmp
+fnplt
xfnrfn

Spline functions (pp-form)
+csapi
+csape
Octave SourceForge, by Kai Habel
?csaps
Octave SourceForge has one which is free for non-commercial use. Dig through the CVS repository until you find it.
xcscvn
xgetcurve

Spline functions (B-form)
xspmak
xspcrv
xspapi
xspap2
xspaps
xspcol
xslvblk
xbkbrk

Knot operations
xaugknt
xaveknt
xbrk2knt
xknt2brk
xknt2mlt
xnewknt
xoptknt