Swiss army knife equations
12-22-2013, 02:37 PM
Post: #5
 Dieter Senior Member Posts: 2,397 Joined: Dec 2013
RE: Swiss army knife equations
(12-22-2013 06:24 AM)walter b Wrote:  Is EQN equivalent to the HP-42S SOLVER ?

Maybe there is a general misunderstanding.

The 42s solver is able to solve an equation that is coded in a programmed subroutine, much like the 34C, 15C and 34s. However, the implementation is somewhat different and more powerful since you may define a function with multiple variables and tell the 42s solver for which one you want to have the equation solved.

The 35s can do all this just as well. But on top of this it also offers another feature: The function does not have to be programmed as a subroutine, you may also enter it directly as an equation in (well, close to) textbook syntax.

The 35s holds a list of equations that can be accessed and edited after pressing the EQN key. You may think of this as a separate memory space where more or less simple equations can be stored. They all may be evaluated, solved and integrated.

Example - consider the pythagorean theorem:

A^2 + B^2 = C^2

Press EQN and enter the formula exactly as described. It now shows up in the equation list. Assume you know A and C and you want to solve for B. Press SOLVE B and you are prompted for A and C, before the 35s returns the result for B. The 35s solver even has some built-in intelligence: if there is an easy closed-form solution it does not have to iterate, instead the solution - here B = sqrt(C^2 - A^2) - is returned immediately.

Dieter
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 Messages In This Thread Swiss army knife equations - walter b - 12-21-2013, 11:02 AM RE: Swiss army knife equations - r. pienne - 12-21-2013, 06:21 PM RE: Swiss army knife equations - Michael de Estrada - 12-21-2013, 11:25 PM RE: Swiss army knife equations - walter b - 12-22-2013, 06:24 AM RE: Swiss army knife equations - Dieter - 12-22-2013 02:37 PM RE: Swiss army knife equations - walter b - 12-23-2013, 11:33 AM RE: Swiss army knife equations - Thomas Radtke - 12-23-2013, 01:33 PM RE: Swiss army knife equations - walter b - 12-23-2013, 04:09 PM RE: Swiss army knife equations - Steve Simpkin - 12-22-2013, 10:28 PM RE: Swiss army knife equations - Michael de Estrada - 12-23-2013, 02:57 PM RE: Swiss army knife equations - Didier Lachieze - 12-23-2013, 02:20 PM RE: Swiss army knife equations - RMollov - 12-23-2013, 03:26 PM RE: Swiss army knife equations - Thomas Radtke - 12-23-2013, 05:15 PM RE: Swiss army knife equations - walter b - 12-23-2013, 06:46 PM RE: Swiss army knife equations - walter b - 12-26-2013, 05:03 PM RE: Swiss army knife equations - Massimo Gnerucci - 12-26-2013, 05:38 PM RE: Swiss army knife equations - Dave Britten - 12-23-2013, 05:26 PM RE: Swiss army knife equations - Thomas Radtke - 12-26-2013, 07:51 PM

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