The Museum of HP Calculators

HP Forum Archive 18

[ Return to Index | Top of Index ]

Best Curve Fitting the HP-67 ?
Message #1 Posted by gileno on 30 Sept 2008, 5:28 p.m.

Does a program exist for HP67/HP97 that calculates the Best Curve Fitting ?

Thank's

      
Re: Best Curve Fitting the HP-67 ?
Message #2 Posted by Peter A. Gebhardt on 30 Sept 2008, 6:47 p.m.,
in response to message #1 by gileno

Gileno,

maybe that's what you are looking for:

"HP-67 Business Decisions Pac", Prog. #17 (p. 17-1 ff.)

It's on the DVD.

Best regards

Peter A. Gebhardt

            
Re: Best Curve Fitting the HP-67 ?
Message #3 Posted by gileno on 30 Sept 2008, 9:14 p.m.,
in response to message #2 by Peter A. Gebhardt

Thank's

                  
Re: Best Curve Fitting the HP-67 ?
Message #4 Posted by Trent Moseley on 1 Oct 2008, 3:56 p.m.,
in response to message #3 by gileno

gileno-

Better yet: "Curve Fitting". It's in the HP-67 "Standard Pac" that came with the calc.

tm

                        
Re: Best Curve Fitting the HP-67 ?
Message #5 Posted by Les Wright on 1 Oct 2008, 5:44 p.m.,
in response to message #4 by Trent Moseley

The Standard Pac routine seems a little bit closer to what gileno is looking for than the Business Pac routine.

I suspect what gileno really was asking about is a program that pick pics the best fit automatically from a list of possibilities (linear, exponential, power, logarithmic) based on the highest r-value. The HP41 Advantage Pac routine CFIT can do this. In the HP67 routine in question, and in the HP41 Stat Pac curve fitting, one must do each fit manually then compare r-values and pick the one you want. That said, there MUST be enough registers even in the HP67/97 to keep track of all of the necessary sums besides those collected in the stats registers.

                              
Re: Best Curve Fitting the HP-67 ?
Message #6 Posted by Gene Wright on 1 Oct 2008, 9:50 p.m.,
in response to message #5 by Les Wright

HP 67 curve fitting - example program

                                    
Re: Best Curve Fitting the HP-67 ?
Message #7 Posted by Les Wright on 2 Oct 2008, 2:06 a.m.,
in response to message #6 by Gene Wright

Gene, that is verbatim the routine from the Standard Pac. What it is missing is what Gileno wants--namely, something that chooses the BEST fit from the four options just by the user entering the data and letting the program do the work.

I think there may be a way to modify the HP67 program to allow for the "best" option provided in the Advantage Pac CFIT program.

Les

      
Gileno, check your email!
Message #8 Posted by Gene Wright on 2 Oct 2008, 8:29 a.m.,
in response to message #1 by gileno

I just sent a couple of emails with the pages of Gary Tenzer's PPC Journal articles on curve fitting to you using the HP 67/97.

Enjoy. Gene

            
Re: Gileno, check your email!
Message #9 Posted by gileno on 2 Oct 2008, 9:57 a.m.,
in response to message #8 by Gene Wright

1000 x thanks

            
Re: Gileno, check your email!
Message #10 Posted by Geir Isene on 2 Oct 2008, 4:49 p.m.,
in response to message #8 by Gene Wright

Feel free to send the e-mail to me as well :)

            
me too! n/t
Message #11 Posted by Les Wright on 2 Oct 2008, 4:58 p.m.,
in response to message #8 by Gene Wright

--

                  
Re: me too! n/t
Message #12 Posted by Gene Wright on 2 Oct 2008, 5:04 p.m.,
in response to message #11 by Les Wright

Ok, I emailed the .gif files of those pages to Les.

Geir, I sent you an email asking you to email me at another address and I will forward them to you.

They all come from the 1978-1979 PPC Journal articles written by Gary Tenzer.

These are on Jake Schwartz' CD ROM scans of these journals.

Alternatively, you can get them at TOS very easily too.

Gene

                        
Re: me too! n/t
Message #13 Posted by Palmer O. Hanson, Jr. on 2 Oct 2008, 8:50 p.m.,
in response to message #12 by Gene Wright

Gene:

Me, too!

Palmer


[ Return to Index | Top of Index ]

Go back to the main exhibit hall