Implicit multiplication  Printable Version + HP Forums (https://archived.hpcalc.org/museumforum) + Forum: HP Museum Forums (https://archived.hpcalc.org/museumforum/forum1.html) + Forum: Old HP Forum Archives (https://archived.hpcalc.org/museumforum/forum2.html) + Thread: Implicit multiplication (/thread113312.html) 
Implicit multiplication  Sam Levy  05082007 I wrote 2PiF and my calculator wouldn't work. I had wrongly assumed that would be understood as multiplication. This led me to ask: Why can't this be designed into the calculator? If one alphs has a power sign, it could be interpreted as applying to that term only. Does anyone know if that has been implemented? Sam
Re: Implicit multiplication  Dia C. Tran  05082007 I am not sure of your expression either so I wouldn't expect a calculator can. I guess you meant 2*Pi*F? It could be interpreted as 2*PiF or 2*P*i*F.
Re: Implicit multiplication  Ron Ross  05082007 Actually, the lower end modern (I could use more descriptive, yet probably vulgar derogatory terms) Hp's and other brands DO such implied multiplication. The higher Hp's look as such a combination as a total descriptive name of a variable (which is way more versatile and powerful, especially if you have a feeble memory as myself!).
The Hp33s and Hp39/40GS series would do as you wish, aside from Pi. That would be P*I. You get the BAD with the good in your example.
Re: Implicit multiplication  Hal Bitton in Boise  05082007 If you are using an RPL machine (48 series, 49 series, or 50g),
PS...it works for big equations too. Re: Implicit multiplication  bill platt  05082007 The 33s doesn't do implicit multiplication, right? I know that the 30s *does* do it, but that is hardly such a great advantage considering the other aspects it lacks.
Parsing the implicit multiplication certainly must be possible in the 48 series if you program a front end for such a purpose. For instance does Erable or ALG48 have that sort of feature?
Re: Implicit multiplication  Palmer O. Hanson, Jr.  05082007 As others in this thread have indicated there can be problems with implicit multiplication if the user doesn't understand the rules; for example, if a machine allowed variable names consisting of more than one character and allowed implied multiplication then it would be hardpressed to tell the difference between a single variable ABC and implied multiplication of three variables A, B, and C. Therefore, machines which allow ABC as the implied multiplication of A and B and C typically limit variable names to single letters. That does limit the number of available variables. Many of the machines which operate in some version of an Equation Operating System which includes the use of parentheses (Oh HORRORS!) allow implied multiplication as in (A + B)(C + D). Some of those machines (the HP33s is one of them) actually eliminate the multiplication as part of assembling the user input; that is, if the user enters ( A + B ) x ( ... the machine doesn't put the multiplication symbol in the display. It really isn't as hard as the typical RPN afficianado makes it out to be.
Re: Implicit multiplication  Maximilian Hohmann  05092007 Hallo!
Quote: The Ti Voyage 200 (or Ti89) does exactly what you ask here! But you have to enter Pi by using the appropriate key. If you enter 2pif it will interpret this as 2*pif, because variable names can have arbitrary length.
Greetings, Max
Re: Implicit multiplication  Palmer O. Hanson, Jr.  05092007 I wrote:
Quote: Actually, my description of the implied multiplication of the algebraic mode of the HP33s was backwards. If the user keys in the following sequence ( RCL A + RCL B ) ( RCL C  RCL D) where the sequence assumes there is implied multiplication then the display will actually show ( A + B ) x ( C  D ) where the machine supplies the multiplication sign.
Mea culpa.
