Slow integral evaluation on HP50g

04222014, 03:50 AM
(This post was last modified: 04222014 03:55 AM by Manolo Sobrino.)
Post: #2




RE: Slow integral evaluation on HP50g
In EMU48 via EQW it works fine and gets this answer (with 10 accurate digits, pay attention to the graph and check if your Number Format is Standard, because then your goal is 12), but only after a little while and using emulation speed. I guess it's Romberg integration, which suffers if the derivatives of the integrand are not continuous, you see that with a small tolerance. Use Approx mode, and change effectively the tolerance via Number Format > FIX 5, for instance.
When you have an abs function, look if there are points in the interval with a value that could permit two slopes (for a global abs any root will be ). There's the trouble: at some point it won't converge for a subinterval there. 

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Messages In This Thread 
Slow integral evaluation on HP50g  cdecastro  04222014, 01:56 AM
RE: Slow integral evaluation on HP50g  Manolo Sobrino  04222014 03:50 AM
RE: Slow integral evaluation on HP50g  kakima  04222014, 03:56 AM

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