From help-octave-request at bevo dot che dot wisc dot edu Fri Dec  5 16:47:02 2003
Subject: Hiding subroutines?
From: Vic Norton <vic at norton dot name>
To: help-octave at bevo dot che dot wisc dot edu
Date: Fri, 5 Dec 2003 17:46:11 -0500

Is there a way to hide functions that are utilities for a main routine?

For example, I am writing a Simplex Method, Phase 2 function, simp2, 
that uses a bunch of utility subroutines. When I compile things and 
ask "who" I see

    *** currently compiled functions:

    ea2b       icmp       ivect2set  ltsolve    simp2      utsolve
    fu         iset2vect  ix2e       replidx    simp2step

I would like to just see "simp2". The other stuff is supporting this. 
Is there some way to accomplish this?

Second question. Some of these "utilities" are undoubtedly internal 
to octave. I wonder if the internal routines can be accessed 
directly. For example "utsolve" and "ltsolve" just solve upper and 
lower triangular systems respectively:

	## utsolve
	x = b;
	for i = m : -1 : 1
		if (U(i,i) == 0)
			error("diagonal element is zero in utsolve\n");
		endif
		x(i,:) = (b(i,:) - U(i,i+1:m) * x(i+1:m,:))/U(i,i);
	endfor

and

	## ltsolve
	x = b;
	for i = 1 : m
		if (L(i,i) == 0)
			error("diagonal element is zero in ltsolve\n");
		endif
		x(i,:) = (b(i,:) - L(i,1:i-1) * x(1:i-1,:))/L(i,i);
	endfor

Regards,

Vic

-- 
*---* mailto:vic at norton dot name
|     Victor Thane Norton, Jr.
|     Mathematician and Motorcyclist
|     phone: 419-353-3399
*---* http://vic.norton.name



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