Programming

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

Logical functions
*xor
*any
*all

Bit operations
+bitand
+bitcmp
+bitor
+bitmax
+bitxor
+bitset
+bitget
+bitshift
Kai Habel has all these [but note comments in bitand.cc]

Sets
*union
+unique
Paul Kienzle, like octave create_set(), but also finds unique rows.
+intersect
Paul Kienzle, like octave intersection()
+setdiff
Paul Kienzle, like octave complement(), with reverse parameters
+setxor
Paul Kienzle
+ismember
Paul Kienzle, !isempty(find(set == element))
Of all these functions, only unique() accepts 'rows' parameter. None yet accept a cell array of strings.

Control structures
*if
*else
*elseif
*end
*for
*while
*break
*switch
*case
*otherwise
*try
*catch
*return

Interpreter interface
*eval
xevalc
*feval
xevalin
xbuiltin
xassignin
xrun
*ans

Constants
*eps
*realmax
*realmin
*pi
*i, j -
*inf
*NaN
*isnan
*isinf
*isfinite

Symbol table
*exist
*global
xisglobal
?persistent
available in 2.1.x as "static"
xmfilename
xmlock
xmunlock
xmislocked

Function arguments
*nargchk
*nargin
*nargout
?varargin
?varargout
Needs special vararg handling.
xinputname

User I/O
*disp
*error
*warning
+lasterr
Paul Kienzle
xlastwarn
*clc
*home
*input
*keyboard
*pause

Inline functions
?inline
Needs inline hack
xargnames
xformula
?char
With inline hack, use type(g), or maybe eval(["type ", g])
xvectorize