HP17BII+  L() & G() Revisited  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: HP17BII+  L() & G() Revisited (/thread99856.html) 
HP17BII+  L() & G() Revisited  Peter A. Gebhardt  09172006 To avoid such erroneous results like described here: http://www.hpmuseum.org/cgisys/cgiwrap/hpmuseum/archv015.cgi?read=74485#74485 After executing the steps described below, everything worked fine on my unit  S/N: CNA42903649 produced on a Monday !!! 2004 Week 29 ... 1. Initialize ALL <variablename> first before you use L(<variablename>:...) Example: INITL: 0*A*B* ... *Z=0 2. In SOLVER menu pres GOLD INPUT to CLEAR ALL VARIABLES! (WARNING  BE CAREFUL HERE! EXIT IMMEDIATELY, TO NOT TO DELETE YOUR STORED EQUATIONS by incidently pressing function key two as well!) 3. Multiply each instance of L(<variablename>:...) by ZERO to avoid sideeffects within your equation. Best regards, Peter A. Gebhardt
Edited: 17 Sept 2006, 2:21 p.m.
HP17BII+  L() & G() Now working on HP49G+ !!!  Peter A. Gebhardt  09172006 Because of the contribution of Tom Sears made on comp.sys.hp48 I finally was able to emulate L() & G() on my HP49G+ ... To test for yourself, take this example from Edition 2 of the HP17BII+ User Guide available here: http://h10032.www1.hp.com/ctg/Manual/c00363348.pdf On page 170 look for the description of L(x:expr): (1+i)^N x PV +((1–(1+i)^N)/(1–(1+i))) x PMT+FV It can be written as: L(NP:1+i) x 0 + L(NPN:G(NP)^N) x PV + ((1G(NPN)) / (1G(NP))) x PMT + FV On the HP49G+ change the last equation to:
<< 'NP x 0 + NPN x PV + ((1NPN) / (1NP)) x PMT + FV'
Quote: In my opinion, it's comparably easy to identify the respective L() & G() parts of the HP17 equation and put them into the list to be worked on by SUBST & STREAM. Because I only tested with this readily available example, pls. comment once you have used the "algorithm" on your own HP17/19/200LX to HP49 migrations. Best regards, Peter A. Gebhardt
Edited: 18 Sept 2006, 12:25 p.m.
