HP-50g Polynomial Coefficient Array Functions
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From: Gjermund Skailand on 20 Aug 2006 07:56 Hi, "Joe Veazey" <charon(a)pluto.sol.milkyway.localcluster.universe0> wrote in message news:Xns9824A18F4BDSleazeyWombat(a)207.115.17.102... > There are a number of numeric functions in the HP-50g for single variable > polynomials, that represent the polynomial as a numeric array, containing > the coefficients of the polynomial stored in dsecending order of the > powers > of the variable. > > That is, the polynomial: > > (1): '4*x^3 + 0.36*x^2 - 7*x + 14' > > would be stored as this numeric array: > > (2): [4.0, 0.36, -7.0, 14.0] > > > MAIN QUESTION: > Is there a function to convert from polynomial form (1) to array form (2) > automatically? I searched thru the documentation and I couldn't find ---- What you want to look at is FPTR2 ^VXXLext input polynomial {list of variables} -> {list of coeffisients } E.g. '4*x^3+ o.36*x' 'f' STO f RCL LVAR AXL --> f { x } ./ get all variables into a list FPTR2 ^VXXLext ./ convert to internal list If you're using the HP49G+ you can get the FPTR2 ^VXXLext function on the stack by entering the following ( --> is right arrow) "CA6206007D40" H--> ./ if flag -85 is set, you'll se FPTR 6 4D7 'VXXLext' STO But be careful, double check the string and make sure whenever you call the function you have symbolic _expression and a list (of variables ) on stack, there are no safeguards. Then your program would be something like this << LVAR AXL VXXLext >> Best regards Gjermund
From: Gjermund Skailand on 20 Aug 2006 08:20 HI WARNING, my hp just went plain dead. Perhaps you should not do as I suggested. I doesn't look good. I have changed batteries, tried paper-clip-reset, removed even the backup battery. Will let you know how it turns out. I had another 49g+ do something similar. Only use is as doorstop. Regards Gjermund "Gjermund Skailand" <gjermund_skailand(a)yahoo.no> wrote in message news:SP6dnUfgSPdl0HXZ4p2dnA(a)telenor.com... > Hi, > "Joe Veazey" <charon(a)pluto.sol.milkyway.localcluster.universe0> wrote in > message news:Xns9824A18F4BDSleazeyWombat(a)207.115.17.102... >> There are a number of numeric functions in the HP-50g for single variable >> polynomials, that represent the polynomial as a numeric array, containing >> the coefficients of the polynomial stored in dsecending order of the >> powers >> of the variable. >> >> That is, the polynomial: >> >> (1): '4*x^3 + 0.36*x^2 - 7*x + 14' >> >> would be stored as this numeric array: >> >> (2): [4.0, 0.36, -7.0, 14.0] >> >> >> MAIN QUESTION: >> Is there a function to convert from polynomial form (1) to array form (2) >> automatically? I searched thru the documentation and I couldn't find > ---- > What you want to look at is FPTR2 ^VXXLext > > input > polynomial > {list of variables} > -> > {list of coeffisients } > > E.g. > '4*x^3+ o.36*x' 'f' STO > f RCL LVAR AXL --> f { x } ./ get all variables into a > list > FPTR2 ^VXXLext ./ convert to internal list > > If you're using the HP49G+ you can get the FPTR2 ^VXXLext function on the > stack by entering the following ( --> is right arrow) > > "CA6206007D40" H--> ./ if flag -85 is set, you'll se FPTR 6 4D7 > > 'VXXLext' STO > > But be careful, double check the string and make sure whenever you call > the function you have symbolic _expression and a list (of variables ) on > stack, there are no safeguards. Then your program would be something like > this << LVAR AXL VXXLext >> > > Best regards > > Gjermund > >
From: Steen Schmidt on 20 Aug 2006 11:28 Joe Veazey wrote: > Is there a function to convert from polynomial form (1) to array form > (2) automatically? http://www.hpcalc.org/hp49/math/symbolic/polyv21.zip Regards Steen
From: Joe Veazey on 21 Aug 2006 00:07 I want to thank everybody who replied. There have been several useful pointers, and some nice examples extremely tight coding in sysRPL. I ended up writing my own last night in a hour or so, based on the example code. I haven't quite tested utterly thouroughly yet, so I'll post it later.
From: John H Meyers on 21 Aug 2006 16:14
On Sat, 19 Aug 2006 15:52:49 -0500, Joe Veazey wrote: > I did have one that worked fine on the HP-48G, > but I found that just copying it over to the 50g didn't quite work, > because of differences in the COLLECT and EXPAND cmds. My 48G has neither COLLECT nor EXPAND (tho it does have COLCT and EXPAN :) [r->] [OFF] |