WP34s quadrature  Printable Version + HP Forums (https://archived.hpcalc.org/museumforum) + Forum: HP Museum Forums (https://archived.hpcalc.org/museumforum/forum1.html) + Forum: Old HP Forum Archives (https://archived.hpcalc.org/museumforum/forum2.html) + Thread: WP34s quadrature (/thread183059.html) 
WP34s quadrature  hugh steers  04262011 Hi, the manual says this works like the 15c, but i get no difference when changing (eg) FIX mode size. is there some way of specifying the accuracy  or am i doing something wrong. right now, im getting really appalling results. 2 figures correct, for example.
Re: WP34s quadrature  Paul Dale  04262011 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.
Re: WP34s quadrature  Walter B  04262011 The manual clearly says "the user interface is as in HP15C." Nothing more.
Walter
Re: WP34s quadrature  Marcus von Cube, Germany  04262011 We can add a more sophisticated approach as a user code routine. Any contributions are welcome.
Re: WP34s quadrature  Namir  04262011 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 userdefined value. The HP15C 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.
