RPL solver question: HP-50G vs HP-48SX - Printable Version +- HP Forums ( https://www.hpmuseum.org/forum)+-- Forum: HP Calculators (and very old HP Computers) ( /forum-3.html)+--- Forum: General Forum ( /forum-4.html)+--- Thread: RPL solver question: HP-50G vs HP-48SX ( /thread-1211.html) |

RPL solver question: HP-50G vs HP-48SX - Jeff_Kearns - 04-30-2014 10:37 PM
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 built-in 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 RE: RPL solver question: HP-50G vs HP-48SX - Joe Horn - 04-30-2014 11:42 PM
(04-30-2014 10:37 PM)Jeff_Kearns Wrote: ... I cannot find or remember how to do the following on the 50G (in the built-in 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 left-shift 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. RE: RPL solver question: HP-50G vs HP-48SX - Jeff_Kearns - 04-30-2014 11:53 PM
(04-30-2014 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 RE: RPL solver question: HP-50G vs HP-48SX - rprosperi - 05-01-2014 01:40 AM
(04-30-2014 11:53 PM)Jeff_Kearns Wrote:(04-30-2014 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? RE: RPL solver question: HP-50G vs HP-48SX - Jeff_Kearns - 05-01-2014 01:50 AM
(05-01-2014 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 RE: RPL solver question: HP-50G vs HP-48SX - Joe Horn - 05-01-2014 07:32 AM
(05-01-2014 01:40 AM)rprosperi Wrote:(04-30-2014 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 left-shift 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 RS-9 and RS+9, which parallel the 48G's RS-4 and LS-4, respectively. |