HP 35s and Solve button (but not in equation catalogue)
09-28-2014, 06:05 PM
Post: #3
 Dieter Senior Member Posts: 2,397 Joined: Dec 2013
RE: HP 35s and Solve button (but not in equation catalogue)
(09-27-2014 05:33 PM)mcjtom Wrote:  Does it mean that it's useless to press SOLVE not being in Equation Catalogue, or is this a valid shortcut (but to solve which equation/programme?).

Solve can be used in two different ways. On the one hand it can solve an equation from the list in EQN mode. On the other hand it can be used for solving a function previously programmed by the user.

In both cases Solve has to know which equation/program to solve. In EQN mode this is done by simply selecting the appropriate equation from the list. Otherwise, i.e. in regular RPN mode, you tell Solve which program to solve by means of the FN= command (yellow-shifted R/S key). If such a program has not been stated before, the 35s of course does not know what function to solve, and so it asks you ("SELECT FN").

Example:
Solve the equation x² – 5 = 0

Code:
A001 LBL A
A002 RCL X
A003 x²
A004 5
A005 -
A006 RTN

FN= A        ; tell the 35s to solve the equation programmed at label A

0 STO X
5            ; provide two initial guesses

SOLVE X     ; Solve equation A for variable X

X= 2,2631   ; result

That's all.

Dieter
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 Messages In This Thread HP 35s and Solve button (but not in equation catalogue) - mcjtom - 09-27-2014, 05:33 PM RE: HP 35s and Solve button (but not in equation catalogue) - Eddie W. Shore - 09-27-2014, 06:23 PM RE: HP 35s and Solve button (but not in equation catalogue) - Dieter - 09-28-2014 06:05 PM RE: HP 35s and Solve button (but not in equation catalogue) - mcjtom - 09-29-2014, 12:42 PM RE: HP 35s and Solve button (but not in equation catalogue) - Dieter - 09-30-2014, 06:34 PM RE: HP 35s and Solve button (but not in equation catalogue) - Thomas Klemm - 09-29-2014, 05:32 PM RE: HP 35s and Solve button (but not in equation catalogue) - mcjtom - 09-30-2014, 11:12 AM RE: HP 35s and Solve button (but not in equation catalogue) - mcjtom - 09-30-2014, 11:52 AM RE: HP 35s and Solve button (but not in equation catalogue) - Thomas Radtke - 09-30-2014, 04:44 PM RE: HP 35s and Solve button (but not in equation catalogue) - Dieter - 09-30-2014, 06:27 PM RE: HP 35s and Solve button (but not in equation catalogue) - rprosperi - 10-01-2014, 01:09 AM RE: HP 35s and Solve button (but not in equation catalogue) - Dieter - 10-01-2014, 05:31 PM RE: HP 35s and Solve button (but not in equation catalogue) - rprosperi - 10-01-2014, 06:52 PM RE: HP 35s and Solve button (but not in equation catalogue) - Jeff_Kearns - 10-03-2014, 06:56 PM RE: HP 35s and Solve button (but not in equation catalogue) - Kyburo - 10-09-2014, 03:43 PM RE: HP 35s and Solve button (but not in equation catalogue) - mcjtom - 09-30-2014, 10:28 PM

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