Quadratic & Cubic Regression RPN progs

[Matt Agajanian]

Hello all.

I'm looking for programs for Cubic and Quadratic Regression programs so that I can program HP-67, HP-34C, HP-41/42S and the other programmable Voyagers, Spices, etc.

Thanks

Edited: 15 Sept 2013, 12:01 a.m.

[Pier Aiello]

With a quick search i have gathered some discussions (from MoHPC) here: Best discussions of Hp calcs' community (wiki4hp)

Edited: 15 Sept 2013, 2:58 a.m.

[Matt Agajanian]

Hello there.

Thanks for the link. What would help me out greatly is if you can tell me what the special symbols (the ones like \lf\->, \->, etc.) in steps 36, 37, 41 and 42 are of the HP-42S program here:

PolyFit for 42S

Thanks

[Pier Aiello]

Dunno, i don't have one. Maybe on the 42s manual is explained or i'll do another search when i have time.

[Andrew Feist]

I'm pretty sure \lf is "line feed" and \-> is "arrow". Don't have a 42, so I don't know how to actually type those in.

[Tom Grydeland]

Quote:

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What would help me out greatly is if you can tell me what the special symbols (the ones like \lf\->, \->, etc.) in steps 36, 37, 41 and 42 are

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\lf is line feed. In the alpha menu (p.2) choose "PUNC", then button 6 from p2 of that menu (hencerforth Alpha/2 > punc/2 > LF)

\-> and \<- are arrows. Alpha/2 > [arrows] > your choice

\SIGMA is the capital greek letter. Alpha/2 > math > \SIGMA

Any other symbols unclear?

[Matt Agajanian]

Okay. Thanks. Moving on, because the ' \ ' symbol is unfamiliar, please clarify steps 52, 91, 94, 190, 225, 229, 243, 259.

Thanks again.

[Jeff O.]

Matt,

I believe the "\" (back-slash) symbol is some sort of "escape" character that the original author used to format the program listing. It is not a command or part of a command to be entered into the calculator. So wherever you see the backslash, just take it out. So your questioned lines would look as follows:

36 |-" [x,y]LF-> Y, na"

37 |-"t# order -> x .."

41 |-"d inLFvars SIGMADAT"

etc.

The "|-" is the append symbol, entered by pressing ENTER after entering alpha entry mode.

I believe that the "*" symbol is intended to be the multiply symbol, which on the 42s is shown as an "x" (lower-case X) elevated one pixel.

As Tom said above, the "^L_F" is the line feed character, which is on the second page of the PUNC menu in alpha mode.

Hope this helps.

Jeff

[Tom Grydeland]

Jeff O. said:

Quote:

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I believe the "\" (back-slash) symbol is some sort of "escape" character that the original author used to format the program listing. It is not a command or part of a command to be entered into the calculator. So wherever you see the backslash, just take it out.

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That's the way I read it also. I would say "replace the \ and the character(s) that immediately follow with the (unprintable) character they are meant to represent."

So, the string "\->" in the listing represent _one_ character in a HP-42S string, namely {right arrow}.

Similarly, I suppose "\.." represents the "ellipsis" character, Alpha/2 > Punc/2 > {...}

Does anyone have instructions on how to actually use this program?

[Jeff O.]

Quote:

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I would say "replace the \ and the character(s) that immediately follow with the (unprintable) character they are meant to represent."

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Yes, that is a better way to explain it.

I did not think to look for the ellipsis in the PUNC menu. He probably meant that, but I wonder why he did not type three dots in the listing.

Regarding how to use, I have no personal knowledge. The PREGR.TXT file available at hpcalc.org tells how to use the HP-48 version.

Edited: 18 Sept 2013, 7:50 a.m.