Calling Octave built in functions from C, not C++

[Allan Branscomb]

Hello;

Searching the Octave user manual, the email archives, and the Web, I can 
find examples in which Octave built-in functions are called from C++ but 
none from C.

There is mention that it can be done but I haven't been able to find any 
examples in which C is the calling language.

The task is to call the polyfit and polyval functions from a C 
function.  I've implemented this from C to Matlab but don't see how it 
is done with Octave.

I want to call these functions directly, without use of the Octave 
interpreter.  I found a discussion on the Web in which it is stated that 
built-in functions can be called without use of the interpreter and for 
performance reasons would prefer this approach if possible.

Thanks for your help;
Allan