RPL solver question: HP50G vs HP48SX

04302014, 10:37 PM
Post: #1




RPL solver question: HP50G vs HP48SX
I am still very much a neophyte when it comes to RPL calculators, although I own a 48SX, 48GX, 49G+, and a 50G, so bear with me as I ask for help on this relatively trivial problem which doesn't even involve programming. I cannot find or remember how to do the following on the 50G (in the builtin TVM solver), whereas it is a piece of cake on the 48SX with the TVM feature of the Equation Library card:
An example of what I want to do on the 50G (or 49g+ which is identical) is enter an interest rate via the edit feature that is either a function of the number of compounding periods, or a simple formula e.g. '1/(a*b*c)*d', where a, b, c, and d are real numbers  and all I get is "Error: Too few Arguments" or "Invalid Syntax". On the 48SX it is a simple procedure: Recall N to the stack (BLUE SHIFT N), calculate the value for I using classic  well almost  RPN, press the soft menu key for I%YR, enter remaining known variables via the soft menu, then press ORANGE SHIFT and the variable to solve. Voila! Intuitive enough  at least to me. How can I accomplish the same inside the 50G FINANCE menu? Thanks, Jeff K 

04302014, 11:42 PM
(This post was last modified: 04302014 11:43 PM by Joe Horn.)
Post: #2




RE: RPL solver question: HP50G vs HP48SX
(04302014 10:37 PM)Jeff_Kearns Wrote: ... I cannot find or remember how to do the following on the 50G (in the builtin TVM solver) ... How can I accomplish the same inside the 50G FINANCE menu? Which 50g Finance app do you wish to use: the softkey menu obtained by pressing 9 while holding the leftshift key down, or the input form obtained by releasing the shift key before pressing 9? The former works like the '48 (same menu, I think?). The latter uses the standard "input form" method: just fill in the known values, highlight the unknown, and press the SOLVE softkey. If that didn't help, just holler. <0ɸ0> Joe 

04302014, 11:53 PM
(This post was last modified: 04302014 11:54 PM by Jeff_Kearns.)
Post: #3




RE: RPL solver question: HP50G vs HP48SX
(04302014 11:42 PM)Joe Horn Wrote: If that didn't help, just holler. Joe, Both methods you suggest bring up the TVM input screen, even if I toggle flag 117 between CHOOSE boxes and Soft Menu, so I do not see how I can get the same menu as the 48SX Equation Library App. I am therefore not following your post. In "...the standard "input form" method: (where you) just fill in the known values, highlight the unknown, and press the SOLVE softkey", I cannot enter a calculated interest rate  only enter a value. That is my problem. Hollerin' ;) Jeff 

05012014, 01:40 AM
Post: #4




RE: RPL solver question: HP50G vs HP48SX
(04302014 11:53 PM)Jeff_Kearns Wrote:(04302014 11:42 PM)Joe Horn Wrote: If that didn't help, just holler. Jeff: Hold down [RS] and press [7] to get to the Numeric Solver menu, then press [F5] for the TVM menu, then [F1] for the Solver. Pretty sure this is what you are looking for. I'm curious how Joe has found a quicker way to access this, but like you, I get the same menu using the 2 methods he described. What's the secret here Joe? Some obscure flag setting? Bob Prosperi 

05012014, 01:50 AM
Post: #5




RE: RPL solver question: HP50G vs HP48SX
(05012014 01:40 AM)rprosperi Wrote: Hold down [RS] and press [7] to get to the Numeric Solver menu, then press [F5] for the TVM menu, then [F1] for the Solver. That is precisely what I was looking for! Works the same on the GX too. Thank you very much and I too look forward to Joe's response. Jeff 

05012014, 07:32 AM
(This post was last modified: 05012014 07:38 AM by Joe Horn.)
Post: #6




RE: RPL solver question: HP50G vs HP48SX
(05012014 01:40 AM)rprosperi Wrote:(04302014 11:53 PM)Jeff_Kearns Wrote: Both methods you suggest bring up the TVM input screen... OH NOES! Sorry... I have had a key assignment on LS+9 for so long that I forgot it isn't built in. <slaps self> In essence, I did the following one time many years ago: << 79 TMENU >> 74.21 ASN After making that assignment, LS+9 (with the "+" meaning that the leftshift is held down while pressing the 9 key) launches menu 79, same as RS+7, F5, as Bob mentioned above. Needless to say, I leave USER mode turned on all the time. I currently have ... let's see ... RCLKEYS SIZE 1 – 2 / ... 90 key assignments, and I use them so often that I don't need any keyboard overlays or stickers. There's no need to wrestle with HP's suboptimal keyboard choices when you can create your own key assignments. But I must learn to stop assuming that everybody has my key assignments. Sorry about that! Edit: My choice for LS+9 is of course modeled on the existing 50g key definitions for RS9 and RS+9, which parallel the 48G's RS4 and LS4, respectively. <0ɸ0> Joe 

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