HP 15C and INT(1/√(1-x),0,1)

[salvomic]

(01-08-2018 08:37 PM)Mike (Stgt) Wrote:  ...
Two suggestions: i) Use an HP40G or any other machine with CAS, emulated or not, to solve this integral. Before you lift your finger from the Enter key the _exact_ result will be displayed.
ii) If you are interested in the numerical approximation only have a look into the PPC ROM Users' Manual (that comes on the CD from MoHP), routine IG - InteGrate on p. 220 (p. 230 of the PDF). ...

Ciao.....Mike

hello Mike, thanks for advice.
Yes, actually I'm using the Prime and 50g to solve that type of integrals.
With old calculators (like the HP15) I like to test their capability and the various times of execution.
I never noted issues in HP15C (classic) until I tried that integral (and the first time with FIX9!) and the routine never end, so I wondered why...
So I'm trying the same thing in the various calculator I've.
With 50g or Prime the result 2 is returned in few seconds...
I noted also the same problem of HP15C in HP41C with Advanced pac: the used routine should be the same, I believe (reading the manual of the module.
It's better with the HP42s, and definitely with Free42, emulator of HP15, but not i41CX that has the same problem that the real HP41CX.

However, you're right, if it's stupid but it works, it isn't stupid
When I want use HP15C I'll keen FIX low: 2 or 3 and go with wind...

I haven't a 40g, at the moment, only 39g (but still I have not tried in it).

ciao,
Salvo