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HP-32SII strange behavior



#5

Damaged calculator, a bug ,or I am doing something wrong ?

EQN I=U/R (RCL I = RCL U / RCL R ENTER) CK=EFA0 009.0

SOLVE R -> I? 5 R/S -> U? 220 R/S

SOLVING -> DIVIDE BY 0

??????

Hmm...
Same equation

SOLVE I -> U? 220 R/S -> R? 44 R/S

SOLVING -> I=5.0000

Again same equation (I=U/R)

SOLVE R -> I? 5 R/S -> U? 220 R/S

SOLVING -> R=44.0000

Why i get "divide by zero" on first attempt to solve R?



REPLACE THIS TEXT WITH YOUR LISTING

#6

If I remember correctly it will start computing with whatever value is in the variable to solve. So I think that R contained 0 from anything before (perhaps a Clear Var). After solving for I, R didn't contain 0 anymore, so the equation could be evaluated.

#7

Alvar --

Bram's explanation above to your query:

Quote:
If I remember correctly it will start computing with whatever value is in the variable to solve. So I think that R contained 0 from anything before (perhaps a Clear Var). After solving for I, R didn't contain 0 anymore, so the equation could be evaluated.

Bram is correct, but I'll take it one step further: The SOLVE routine first executes the function or program using the stored value of the variable to be solved. If that is not a solution, it then uses the value in the stack x-register for the variable to be solved. The results determine whether or not a solution lies within the range defined by the two "guesses".

So, it's also quite likely that a "DIVIDE BY 0" error will result if the stack x-register contains a zero upon executing SOLVE.

One more thing: The algebraic-equation functionality on the HP-32SII was lifted from the algebraic-entry HP-22S, which has P = I2R and many other simple equations built into a library.





Now, about the equation itself:

I recognize it as Ohm's Law (with "U" denoting voltage or potential difference), with a 5-ampere current and 220 volts.

-- KS

Edited: 16 Mar 2006, 12:45 a.m.


#8

Thanks for explanation, Karl and Bram.

BTW, yes, in example, this is Ohm's Law (just for simplicity).


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