Posts: 850
Threads: 10
Joined: Mar 2009
Hi Pablo,
This is not actually a bug, but a feature. For more difficult or long integrations, you can specify a lower number of significant digits which will increase the speed of the integration at the cost of accuracy. See page 8-6 of the manual for more information.
Cheers,
Bart
Posts: 653
Threads: 26
Joined: Aug 2010
No, this is not a bug but a (quite useful) feature of the HP35s an other calculators with the HP Integrate. It was already implemented in the good old 34C, the first model with this function.
The idea behind this: you set the desired accuracy (by setting the display format) and the calculator provides a result based on that setting. This way you can choose between better precision and faster execution. In Fix 3 the 35s assumes the function it's integrating is given with three valid decimals. In Sci 5 it assumes six significant digits. So, settings like "Fix 9" or even "ALL" will provide a very accurate result, but the 35s may be busy for a few minutes, while Fix 4 returns a result with adequate accuracy within reasonable time.
Of course, all this is documented in the handbook (page 8-2). You will also find a (quite conservative) estimate for the uncertainty of the result in the Y-register.
Dieter
