The following warnings occurred:
Warning [2] Undefined array key 154485 - Line: 275 - File: inc/plugins/threaded_mode.php PHP 8.1.2-1ubuntu2.14 (Linux)
File Line Function
/inc/class_error.php 153 errorHandler->error
/inc/plugins/threaded_mode.php 275 errorHandler->error_callback
/inc/plugins/threaded_mode.php 23 ThreadedMode::showthread_threaded
/inc/class_plugins.php 142 threaded_mode_showthread_threaded
/showthread.php 918 pluginSystem->run_hooks
Warning [2] Undefined array key 154489 - Line: 275 - File: inc/plugins/threaded_mode.php PHP 8.1.2-1ubuntu2.14 (Linux)
File Line Function
/inc/class_error.php 153 errorHandler->error
/inc/plugins/threaded_mode.php 275 errorHandler->error_callback
/inc/plugins/threaded_mode.php 23 ThreadedMode::showthread_threaded
/inc/class_plugins.php 142 threaded_mode_showthread_threaded
/showthread.php 918 pluginSystem->run_hooks
Warning [2] Undefined array key 154513 - Line: 275 - File: inc/plugins/threaded_mode.php PHP 8.1.2-1ubuntu2.14 (Linux)
File Line Function
/inc/class_error.php 153 errorHandler->error
/inc/plugins/threaded_mode.php 275 errorHandler->error_callback
/inc/plugins/threaded_mode.php 23 ThreadedMode::showthread_threaded
/inc/class_plugins.php 142 threaded_mode_showthread_threaded
/showthread.php 918 pluginSystem->run_hooks
Warning [2] Undefined variable $thread - Line: 295 - File: inc/plugins/threaded_mode.php PHP 8.1.2-1ubuntu2.14 (Linux)
File Line Function
/inc/class_error.php 153 errorHandler->error
/inc/plugins/threaded_mode.php 295 errorHandler->error_callback
/inc/plugins/threaded_mode.php 23 ThreadedMode::showthread_threaded
/inc/class_plugins.php 142 threaded_mode_showthread_threaded
/showthread.php 918 pluginSystem->run_hooks
Warning [2] Trying to access array offset on value of type null - Line: 295 - File: inc/plugins/threaded_mode.php PHP 8.1.2-1ubuntu2.14 (Linux)
File Line Function
/inc/class_error.php 153 errorHandler->error
/inc/plugins/threaded_mode.php 295 errorHandler->error_callback
/inc/plugins/threaded_mode.php 23 ThreadedMode::showthread_threaded
/inc/class_plugins.php 142 threaded_mode_showthread_threaded
/showthread.php 918 pluginSystem->run_hooks
Warning [2] Undefined variable $fid - Line: 295 - File: inc/plugins/threaded_mode.php PHP 8.1.2-1ubuntu2.14 (Linux)
File Line Function
/inc/class_error.php 153 errorHandler->error
/inc/plugins/threaded_mode.php 295 errorHandler->error_callback
/inc/plugins/threaded_mode.php 23 ThreadedMode::showthread_threaded
/inc/class_plugins.php 142 threaded_mode_showthread_threaded
/showthread.php 918 pluginSystem->run_hooks
Warning [2] Undefined array key 154513 - Line: 331 - File: inc/plugins/threaded_mode.php PHP 8.1.2-1ubuntu2.14 (Linux)
File Line Function
/inc/class_error.php 153 errorHandler->error
/inc/plugins/threaded_mode.php 331 errorHandler->error_callback
/inc/plugins/threaded_mode.php 332 ThreadedMode::buildtree
/inc/plugins/threaded_mode.php 332 ThreadedMode::buildtree
/inc/plugins/threaded_mode.php 304 ThreadedMode::buildtree
/inc/plugins/threaded_mode.php 23 ThreadedMode::showthread_threaded
/inc/class_plugins.php 142 threaded_mode_showthread_threaded
/showthread.php 918 pluginSystem->run_hooks
Warning [2] Undefined variable $theme - Line: 3 - File: inc/plugins/threaded_mode.php(305) : eval()'d code PHP 8.1.2-1ubuntu2.14 (Linux)
File Line Function
/inc/class_error.php 153 errorHandler->error
/inc/plugins/threaded_mode.php(305) : eval()'d code 3 errorHandler->error_callback
/inc/plugins/threaded_mode.php 305 eval
/inc/plugins/threaded_mode.php 23 ThreadedMode::showthread_threaded
/inc/class_plugins.php 142 threaded_mode_showthread_threaded
/showthread.php 918 pluginSystem->run_hooks
Warning [2] Trying to access array offset on value of type null - Line: 3 - File: inc/plugins/threaded_mode.php(305) : eval()'d code PHP 8.1.2-1ubuntu2.14 (Linux)
File Line Function
/inc/class_error.php 153 errorHandler->error
/inc/plugins/threaded_mode.php(305) : eval()'d code 3 errorHandler->error_callback
/inc/plugins/threaded_mode.php 305 eval
/inc/plugins/threaded_mode.php 23 ThreadedMode::showthread_threaded
/inc/class_plugins.php 142 threaded_mode_showthread_threaded
/showthread.php 918 pluginSystem->run_hooks
Warning [2] Undefined variable $theme - Line: 3 - File: inc/plugins/threaded_mode.php(305) : eval()'d code PHP 8.1.2-1ubuntu2.14 (Linux)
File Line Function
/inc/class_error.php 153 errorHandler->error
/inc/plugins/threaded_mode.php(305) : eval()'d code 3 errorHandler->error_callback
/inc/plugins/threaded_mode.php 305 eval
/inc/plugins/threaded_mode.php 23 ThreadedMode::showthread_threaded
/inc/class_plugins.php 142 threaded_mode_showthread_threaded
/showthread.php 918 pluginSystem->run_hooks
Warning [2] Trying to access array offset on value of type null - Line: 3 - File: inc/plugins/threaded_mode.php(305) : eval()'d code PHP 8.1.2-1ubuntu2.14 (Linux)
File Line Function
/inc/class_error.php 153 errorHandler->error
/inc/plugins/threaded_mode.php(305) : eval()'d code 3 errorHandler->error_callback
/inc/plugins/threaded_mode.php 305 eval
/inc/plugins/threaded_mode.php 23 ThreadedMode::showthread_threaded
/inc/class_plugins.php 142 threaded_mode_showthread_threaded
/showthread.php 918 pluginSystem->run_hooks
Warning [2] Undefined variable $lang - Line: 5 - File: inc/plugins/threaded_mode.php(305) : eval()'d code PHP 8.1.2-1ubuntu2.14 (Linux)
File Line Function
/inc/class_error.php 153 errorHandler->error
/inc/plugins/threaded_mode.php(305) : eval()'d code 5 errorHandler->error_callback
/inc/plugins/threaded_mode.php 305 eval
/inc/plugins/threaded_mode.php 23 ThreadedMode::showthread_threaded
/inc/class_plugins.php 142 threaded_mode_showthread_threaded
/showthread.php 918 pluginSystem->run_hooks
Warning [2] Attempt to read property "messages_in_thread" on null - Line: 5 - File: inc/plugins/threaded_mode.php(305) : eval()'d code PHP 8.1.2-1ubuntu2.14 (Linux)
File Line Function
/inc/class_error.php 153 errorHandler->error
/inc/plugins/threaded_mode.php(305) : eval()'d code 5 errorHandler->error_callback
/inc/plugins/threaded_mode.php 305 eval
/inc/plugins/threaded_mode.php 23 ThreadedMode::showthread_threaded
/inc/class_plugins.php 142 threaded_mode_showthread_threaded
/showthread.php 918 pluginSystem->run_hooks





How to prevent automatic substitution during SIMPLIFY



#4

I am new to the HP-50g, and I am noticing the following problem.
If I have an expression, say,

M * Q * (Q+1) * (Q-1) + 1
--------------------------
M + M * Q
and I hit SIMPLIFY, then the 50g tries to find definitions for M and Q, not only in the current directory, but (at least) in all the path from the current directory to the root. So if, say, one level above while working on something else I have variable M with value 0.3, when I click SIMPLIFY the value will be plugged into the expression, and the result will not be an expression in M and Q any more.
This is true also for EXPAND.
COLLECT works "correctly", just working on the equation at hand.

Is this the intended behavior?
How can I prevent variable expansion from taking place? I would simply like to be able to work on an expression, regardless of what variables I might have defined at an upper level (or at the same level).

I am using the latest ROM, C-2.15, if this makes a difference.
Many thanks!

Luca


#5

Hello Luca,

Many of the users of this forum primarily use the older HP calculators. The hp-50g is based on the hp-48 series of calculators, and you will probably have better luck finding your answers on a list devoted to those, such as the comp.sys.hp48 newsgroup (easily accessible using google groups). I'd suggest using the search function, as that list has probably answered similar questions from someone in a position similar to yourself.

You can also find most of your answers in the Users Guide or the HP 50g Advanced User's Reference Manual.

Generally speaking, the answer to "Is this the intended behavior?" is "yes" as the ROMs are very mature.

-Jonathan

(edit: forgot to sign my name)

Edited: 16 Aug 2009, 9:51 p.m.


#6

Thanks, I will follow this advice.
I also usually use older calculators (the 32SII is my favorite, due to speed of operation, followed by the 42S); I got a 50g for its CAS abilities -- but I have difficulties making it work as I like.

Best, Luca.


Possibly Related Threads…
Thread Author Replies Views Last Post
  [HP-Prime CAS] Automatic Simplification (Direct Answer) CompSystems 6 2,066 07-26-2013, 07:20 PM
Last Post: Gilles Carpentier
  Simplify with sci/eng on hp 50g Juraj O. 11 3,185 11-08-2012, 06:26 PM
Last Post: Han
  Bug in SIMPLIFY? (hp 50g) Luca 6 1,754 08-20-2009, 05:03 PM
Last Post: Nigel J Dowrick
  Automatic HP41CX Program Bill Lafferty 2 965 06-18-2008, 06:57 AM
Last Post: Bill Lafferty
  HP35S automatic renumbering mess designnut 1 826 02-09-2008, 02:07 AM
Last Post: George Bailey (Bedford Falls)
  EMU48 (HP 48GX) prevent auto-shutoff? Gerard Pinzone 2 1,019 01-31-2007, 08:35 AM
Last Post: Gerard Pinzone
  HP-41: Automatic copy of several programs from a module Geir Isene 3 1,209 12-29-2006, 12:25 AM
Last Post: Raymond Del Tondo
  How to simplify SUM(k=0,inf,x^k/k!) ? Marcus von Cube, Germany 1 880 10-11-2006, 10:29 PM
Last Post: Crawl
  hp49g+ "automatic" overclock upon "On" Eric Lundgren 2 1,015 03-18-2005, 01:17 AM
Last Post: Eric Lundgren
  Substitution for thermal paper for HP printers Frank Glitz 10 2,377 03-24-2002, 03:05 PM
Last Post: David Smith

Forum Jump: