HP 15C and INT(1/√(1-x),0,1)

[salvomic]

(01-09-2018 04:53 PM)Didier Lachieze Wrote:  I’ve removed two steps from your function code:

...

On the DM42 with Main and Goose LCD refresh disabled and USB power it takes 1’07” to return 1,99998387978 with ACC=1E-5 and 2’39” when on battery.
With Main and Goose LCD refresh enabled it takes 1’19’’ on USB power and 3’26” on battery.

Didier, thanks for tests!
I'm trying your code with HP42s and HP15 (original and LE) again...
HP 42s:
accuracy 1E-6: no results after 4h, then I stopped the calculator
accuracy 1E-5: 1.999967 (Y=0.000020) after 1h10m

(01-08-2018 10:15 PM)Dieter Wrote:  ...
I now tried the integrate function of Free42 Decimal 1.5.5. with a modified function that records the largest X during integration. For ACC=1E–8 (result: 1.99999596995) the largest X was 0,999999999956, i.e. 1–4,4E–11. With 10 digit precision this rounds to 1 so that 1–x becomes zero and 1/x generates an error.

Interesting...

(01-08-2018 10:15 PM)Dieter Wrote:  But once again – try this on your 15C and see what you get.

Dieter

ok Dieter, similar result here with Free42...
Now, I'll try again with your hints in the real HP42.
However, yesterday I tried and here the results:

(01-08-2018 04:07 PM)salvomic Wrote:  ...
After 75 mins the old HP15C is still running...
At this time (after a pause) I start again LE with FIX5.
After 25 mins LE returns 1.99999 and old HP15 still running (just now since 100 mins)...
At the end I stopped HP15C (old) after about 2h without the result (with FIX4)...

original HP15 had problems already with 1E-5, HP 15C LE returned the result with 1E-5 in 25 minutes but returned error with 1E-6...