HP Forum Archive 14

[ Return to Index | Top of Index ]

Normal Distribution for HP 17B, 17BII+ posted Message #1 Posted by Bob Wang on 2 Mar 2004, 10:45 p.m. I've just posted some normal distribution programs for the 17B and 17BII+ which reportedly lack the L() and G() functions. http://home.comcast.net/~bobwang/index.htm Feedback, suggestions, corrections, etc. are welcomed. Thanks, Bob bobwang@comcast.net

F=ERF(X) Message #2 Posted by Tizedes Csaba on 3 Mar 2004, 6:18 p.m., in response to message #1 by Bob Wang Hello, if you like Taylor-series, try this: ERF:F=2/SQRT(2*PI)*SUMMA(I:0:N:1:(-1)^I*X^(2*I+1)/((2*I+1)*2^I*FACT(I))) This calculates Gaussian 'error-integral' between -x and x. Some useful thing: F>=0 and x>=0 (always) if you want to solve for X, use the following method: Xmin [X] Xmax [X] [X] if F<0.683 (68.3%) then use: 0 [X] 1 [X] [X] if 0.683<F<0.955 (68.3%...95.5%) then use: 1 [X] 2 [X] [X] try to use some N's: with N=19 in x=-3...3 works perfectly with five significant digits Csaba

Re: F=ERF(X) Message #3 Posted by Bob Wang on 3 Mar 2004, 11:15 p.m., in response to message #2 by Tizedes Csaba Thanks, I'll try out the Taylor series Bob

Re: F=ERF(X) Message #4 Posted by Bob Wang on 4 Mar 2004, 8:30 p.m., in response to message #2 by Tizedes Csaba Csaba: Thanks for the reference to Taylor Series. I've included a new program that is accurate to 3E-12 in the -3 to 3 range. http://home.comcast.net/~bobwang/index.htm Bob

L() and G() functions Message #5 Posted by Max on 4 Mar 2004, 9:53 p.m., in response to message #1 by Bob Wang Quote: I've just posted some normal distribution programs for the 17B and 17BII+ which reportedly lack the L() and G() functions. The older algebraic-only 17B supports LET-GET alright.

Re: L() and G() functions Message #6 Posted by Bob Wang on 4 Mar 2004, 10:44 p.m., in response to message #5 by Max Thanks Max for pointing that out. I don't have a 17B, nor a 17BII+ to test, so I have to rely on "word-of-mouth". I've updated the documents to reflect the fact that the 17B does in fact support L() and G(). Bob

[ Return to Index | Top of Index ]

Go back to the main exhibit hall