Summation bug? (HP-49G, 50g)
01-13-2015, 10:26 PM
Post: #6
 Gerson W. Barbosa Senior Member Posts: 1,465 Joined: Dec 2013
RE: Summation bug? (HP-49G, 50g)
(01-13-2015 09:54 PM)Claudio L. Wrote:  Apparently, the summation is done in "approx" mode even with the calculator in exact mode, so the exponents of x as well as the constants after the summation are real numbers, then the CAS is unable to simplify x^N/x.
Manually editing the result of SUM to change all reals into integers then EVAL in exact mode will finally get rid of the spurious x in the denominator.

I don't know if SUM is supposed to do this or not, but it's certainly an unexpected behavior, not very user-friendly.

Claudio

Thanks you very much for your analysis of the problem. I've tried both exact and approximate modes and a combination of flag settings to no avail. This is not the first time I had trouble with summation on the 50g, problems the HP-48 didn't have. The last one was indeed a bug and has already been fixed.

Regards,

Gerson.
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 Messages In This Thread Summation bug? (HP-49G, 50g) - Gerson W. Barbosa - 01-13-2015, 07:06 PM RE: Summation bug? (HP-49G, 50g) - Thomas Klemm - 01-13-2015, 09:25 PM RE: Summation bug? (HP-49G, 50g) - Gerson W. Barbosa - 01-13-2015, 10:13 PM RE: Summation bug? (HP-49G, 50g) - Claudio L. - 01-13-2015, 09:40 PM RE: Summation bug? (HP-49G, 50g) - Claudio L. - 01-13-2015, 09:54 PM RE: Summation bug? (HP-49G, 50g) - Gerson W. Barbosa - 01-13-2015 10:26 PM RE: Summation bug? (HP-49G, 50g) - Thomas Klemm - 01-15-2015, 01:28 AM RE: Summation bug? (HP-49G, 50g) - Gerson W. Barbosa - 01-15-2015, 09:37 AM

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