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Hello,
HP 17BII+ has a flaw. It does not run some Solver functions writen for HP 17BII and HP 19BII. Does anybody know why?
Regards
Iracildo

Olá Iracildo,

Bob Wang and others have already discussed about the HP-17BII+ and the solver in this old posting:

"New" 17BII+ L() and G() strange behaviour

Hope this helps,

Gerson.

Olá, Gerson.
Thanks for your help. Now I know the flaw with the L() and G() functions. But my problem is another one. It is with the Summation function.
I type in the equation SUM: A = SIGMA(N:1:N:1:2xN) in the HP 17BII+ Solver. (SIGMA is the greek letter found in the ALPHA -> WXYZ -> OTHER -> MORE menu.) Surprisingly, the counter variable, N, does not appear in the equation menu. Only the variable 'A' appears. With the same equation in the HP 17BII, both variables, A and N, appear in the equation menu.
I do not know if the Hewlett-Packard Company knows this flaw of the 17BII+. The serial number of my calculator is CNA 53401455.
Regards
Iracildo

Hi!!

Does your unit still behaves the L() and G() function's flaws (as described by Bob Wang & others)?

Best Regards,

Walter

Hello Walter,
My unit does not have the L() and G() functions flaw. I tested it with Vincent Weber's equation and it gave correct results. Until now, the only flaw I saw was in the Summation function.
Best Regards
Iracildo

Iracildo:

Wah Wong reported this behavior:

http://www.hpmuseum.org/cgi-sys/cgiwrap/hpmuseum/archv015.cgi?read=73022

I have INIT:A+B+C...+X+Y+Z as the first equation in my library so I can re-initialize all one-letter variables if I ever delete some.

If that doesn't make N appear, you could explicitly add 0xN to your expression.

I don't have my 17BII+ to try this out, but you have a newer ROM than I anyway.

Bob

Hi Bob,
Thanks for helping. I tried your first suggestion, but it did not work. I created an equation INI:Y=N and ran this equation. Then I ran the SUM equation. But the variable N does not appear in the menu.
The SUM function is as follows:
SUM:A=SIGMA(N:1:N:1:2xN)
For the second suggestion, I tried:
SUM:A=SIGMA(0xN:1:N:1:2xN) -> The HP 17BII+ returns an INVALID EQUATION message;
SUM:A=SIGMA(N:1:0xN:1:2xN) -> The N variable does not appear in the menu;
Then I tried the following:
SUM:A=0xN+SIGMA(N:1:N:1:2xN) -> Now, the N variable appear in the menu, but A=0 for any value of N. It seems the value of N entered in the menu does not go to the Summation function.
Best Regards
Iracildo

Edited: 4 Apr 2006, 11:37 p.m.