35s Minor Complaint and Minor Correction



#2

Minor beef: The RND (round) function does't work on a complex number as it does on the 42s; you get "INVALID DATA". The wrong shift key is indicated for the RND (round) function on page G-13 of the User's Guide.

tm


#3

Hi, Trent --

Quote:
Minor beef: The RND (round) function does't work on a complex number as it does on the 42s; you get "INVALID DATA". The wrong shift key is indicated for the RND (round) function on page G-13 of the User's Guide.

Yep, I'd say that's either a bug, or the functional specification was undefined, so RND fell by default to "invalid for complex arguments".

Hmm, I'd never thought about that one, so I had to try it out:

RND for a complex number on the HP-42S rounds both components. This makes sense for its paradigm; to round only one component, use the following:

COMPLEX   (RPL "C->R") 
(x<>y for real)
RND
(x<>y for real)
COMPLEX (RPL "R->C")

On the HP-15C, RND operates only on the real component. This is consistent with its documentation on p. 24 of the Owner's Handbook, in that "Number Alteration Functions" operate only on the number in the display. This also makes more sense for its paradigm; to RND both parts, the following sequence is easier:

RND
Re<->Im
RND
Re<->Im

than for the user to separate and reassemble the components if only one component is to be RND'ed.

Another example of good thinking by those "A-team" H-P calculator engineers in the 1980's...

-- KS

Edited: 29 July 2007, 1:11 a.m.


Possibly Related Threads…
Thread Author Replies Views Last Post
  Another minor Prime hexagesimal issue Jonathan Cameron 1 1,420 11-08-2013, 02:37 PM
Last Post: Michael de Estrada
  minor visual bug in INPUT Han 0 982 10-03-2013, 01:13 PM
Last Post: Han
  Minor suggestions for next edition of WP-34S manual Marcel Samek 4 1,866 08-21-2013, 01:30 AM
Last Post: Walter B
  [wp34s] Minor Issue with Stopwatch on real hardware RalfGeiger 3 2,168 04-16-2013, 04:12 PM
Last Post: Eric Smith
  RPL prog for Fibonacci on HP 48G needs minor modification. help. wildpig 68 17,229 07-09-2012, 09:38 AM
Last Post: Gilles Carpentier
  {WP34S] Minor stats bug Nigel J Dowrick 25 5,519 10-31-2011, 06:01 PM
Last Post: Paul Dale
  HP SmartCalc 300s customer complaint hpnut 20 5,048 07-09-2009, 05:29 AM
Last Post: Bart (UK)
  A minor tool for the arsenal. Paul Brogger 1 889 12-18-2008, 07:11 PM
Last Post: MikeO
  My minor 35s modifications Hugh Evans 43 10,277 06-05-2007, 11:22 PM
Last Post: Dave Shaffer
  Just for some Minor Amusement Chuck 7 2,104 03-31-2007, 12:45 AM
Last Post: Chuck

Forum Jump: