HP Forum Archive 21

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[WP34S] A funny bug in Pi (prod) Message #1 Posted by Eduardo Duenez on 27 Jan 2013, 11:33 p.m. Hi, I was using my 34S flashed to recent 3350 calc-full.bin I had never used the sum (Sigma) and product (Pi) functions. I coded the identity function f(x)=x trivially: LBL B RTN Then I tried adding 1+2+...+10 with Sigma: 1 [ENTER] 10 [SIGMA] B Output: 55 (correct). Then tried to find 10! instead 1 [ENTER] 10 [PI] B Output: 0 (should be 10!=3628800) There is a funny bug in the implementation of PI (product), but not in SIGMA. Cheers, Eduardo

Re: [WP34S] A funny bug in Pi (prod) Message #2 Posted by Paul Dale on 28 Jan 2013, 3:29 a.m., in response to message #1 by Eduardo Duenez Both of these functions take one argument from the stack which is a loop index for the DSL instruction. In both cases you are summing/multiplying from 0 to 10 not 1 to 10. You want 10.001 {PI} B. - Pauli

Re: [WP34S] A funny bug in Pi (prod) Message #3 Posted by Eduardo Dueñez on 28 Jan 2013, 12:38 p.m., in response to message #2 by Paul Dale My bad. RTFM! Thanks, Eduardo Quote: You want 10.001 {PI} B. - Pauli

Re: [WP34S] A funny bug in Pi (prod) Message #4 Posted by Walter B on 28 Jan 2013, 3:41 a.m., in response to message #1 by Eduardo Duenez Compare p. 112 of the manual. d:-)

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