Romberg Integration for 33s, 35s  Printable Version + HP Forums (https://archived.hpcalc.org/museumforum) + Forum: HP Museum Forums (https://archived.hpcalc.org/museumforum/forum1.html) + Forum: Old HP Forum Archives (https://archived.hpcalc.org/museumforum/forum2.html) + Thread: Romberg Integration for 33s, 35s (/thread215491.html) 
Romberg Integration for 33s, 35s  Matt Agajanian  03252012 Hello all. I looked through the Arrticle Archives and the 34s port is a little bit hard to understand and it seems that the register exchange instructions are cryptic.
So, has anyone ported the WP34S Romberg Integration program to the 33s or 35s? If so, could you let me know and if it's suitable, could you list the program and instructions, please? Thanks Edited: 25 Mar 2012, 1:45 a.m.
Re: Romberg Integration for 33s, 35s  Paul Dale  03252012 The code in the articles section is straight port of the 41C PPC integration routine. The PPC manual has extensive documentation on all its routines and this one isn't an exception. Don't have the PPC manual? Buy the museum DVD set. It is on there.
Re: Romberg Integration for 33s, 35s  Matt Agajanian  03252012 Got the DVD a coupla week, ago. Which item should I be looking for?
Re: Romberg Integration for 33s, 35s  Gerson W. Barbosa  03252012 You should look for HP41C PPC ROM Users Manual in Calculator Software Manuals.
Re: Romberg Integration for 33s, 35s  Matt Agajanian  03252012 Sounds like a plan
Re: Romberg Integration for 33s, 35s  Nick_S  03262012 Quote: Is this the same routine as the modified Romberg integration method used in the 15c?
Nick
Re: Romberg Integration for 33s, 35s  Paul Dale  03262012 The 15c has a machine code implementation not a keystroke program, so they won't be the same. However the basic algorithm will be similar.
 Pauli
Re: Romberg Integration for 33s, 35s  Nick_S  03262012 I gather that the 15c uses nonuniformly spaced samples to avoid problems with periodic integrands and that it usually does not evaluate the function at either limit of integration to reduce problems when the function is not defined at the one of the limits. Do you know if these features are also implemented in the PPC integration routine? Nick
Edited: 26 Mar 2012, 7:10 a.m.
Re: Romberg Integration for 33s, 35s  Paul Dale  03262012 Nonuniform samples is a standard transform. Not evaluating at the end points is part of the algorithm I believe.
Re: Romberg Integration for 33s, 35s  Nick_S  03262012 Thanks for this information. I also came across the forum article by Les Wright which gives the wp34s version of the code here: http://www.hpmuseum.org/cgisys/cgiwrap/hpmuseum/articles.cgi?read=1126 he says that "There are first two transformations of variablethe first a linear one to standardize the interval of integration to [1,1], the second a nonlinear one so that points are sampled at uneven intervals and problems with some periodic functions are avoided." I look forward to playing with this code on other platforms. Nick
Edited: 26 Mar 2012, 10:01 a.m.
