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There is no way to change the precision of the integration.

We're using a Gauss/Kronrod quadrature with a fixed number of points. It won't be terribly good for "difficult" functions.

- Pauli

Posts: 4,587

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The manual clearly says "the user interface is as in HP-15C." Nothing more.

Walter

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If I am not mistaken, the SOLVE and INTEGRATE functions had Professor Kahan as it's mentor. Kahan's philosophy was to push the accuracy to the machine limits and not by a user-defined value.

The HP-15C Advanced Functions Handbook has a section "Accuracy of the Function to be Integrated" that specifies the accuracy of the integral, which is basically the accuracy of the function you are integrating. This tells me that if you are integrating a function using an empirical approximation, then expect more error in the integral.

Namir

*Edited: 26 Apr 2011, 8:35 a.m. *