Home screen, RPN, sum formula not updatable

05012021, 01:24 PM
Post: #1




Home screen, RPN, sum formula not updatable
I can run a sigma (sum) formula on home screen (RPN mode).
https://ibb.co/wgZJbrL If I duplicate it and slightly modify it (10000 in place of 1000), I get an (not meaningful) error. https://ibb.co/WfpDSGv In Texbook mode, no problem.  HP 48GX, Prime G2, 50G, 28S. A long time ago : 11C, 15C, 28C. SwissMicros DM42, DM15L 

05012021, 11:23 PM
Post: #2




RE: Home screen, RPN, sum formula not updatable
(05012021 01:24 PM)OlidaBel Wrote: I can run a sigma (sum) formula on home screen (RPN mode). There should be 4 right parens after ATAN(X Tom L Cui bono? 

05012021, 11:47 PM
Post: #3




RE: Home screen, RPN, sum formula not updatable
(05012021 11:23 PM)toml_12953 Wrote:The parens look balanced to me. I've noticed this issue myself.(05012021 01:24 PM)OlidaBel Wrote: I can run a sigma (sum) formula on home screen (RPN mode). 

05012021, 11:50 PM
Post: #4




RE: Home screen, RPN, sum formula not updatable
When I input the summation you describe, using radians and RPN, the expression is encapsulated by single quotes: 'Sum etc. etc.'
It seems you have to first press shift + parentheses key (which will give you single quotes): ' ' Then select and press Enter on the expression on the stack you want to modify. This worked for me. 

05022021, 05:36 AM
Post: #5




RE: Home screen, RPN, sum formula not updatable
First of all you have to put the two quotes (shift + "parenthesis" key), then you have to select the sum and duplicate it with "Stack" and "Echo". Then change "1000" to "10000", press "Enter" and "shift eval".


05022021, 11:43 AM
(This post was last modified: 05022021 11:50 AM by toml_12953.)
Post: #6




RE: Home screen, RPN, sum formula not updatable
(05022021 05:36 AM)robmio Wrote: First of all you have to put the two quotes (shift + "parenthesis" key), then you have to select the sum and duplicate it with "Stack" and "Echo". Then change "1000" to "10000", press "Enter" and "shift eval". I didn't have to do any of that. All I did was press the up direction until the expression was highlighted, then hit enter. The expression appeared on the command line. I then moved to the 1000 and added a zero. Then I hit Enter again and the new expression was calculated. I'm using the 2.1.14575 (2021 04 28) Beta. Tom L Cui bono? 

05022021, 12:17 PM
Post: #7




RE: Home screen, RPN, sum formula not updatable
(05022021 11:43 AM)toml_12953 Wrote:(05022021 05:36 AM)robmio Wrote: First of all you have to put the two quotes (shift + "parenthesis" key), then you have to select the sum and duplicate it with "Stack" and "Echo". Then change "1000" to "10000", press "Enter" and "shift eval". Your method probably works in "Textbook" mode, not in "RPN" mode. In "RPN" mode your method works only if you first hit "shift" + parenthesis: ' '. Am I wrong? Sincerely, Roberto 

05022021, 01:23 PM
Post: #8




RE: Home screen, RPN, sum formula not updatable
I don't mean this flippantly. You're better off avoiding RPN mode on the Prime altogether. As Cyrille himself admitted in a recent interview, RPN on the Prime is an afterthought (unlike the RPL line of calculators up to and inclusive of the 50g).
There are so many pain points, it's simply not worth the effort. 

05022021, 01:42 PM
Post: #9




RE: Home screen, RPN, sum formula not updatable
(05022021 01:23 PM)jonmoore Wrote: I don't mean this flippantly. You're better off avoiding RPN mode on the Prime altogether. As Cyrille himself admitted in a recent interview, RPN on the Prime is an afterthought (unlike the RPL line of calculators up to and inclusive of the 50g). Indeed, using "RPN" on the HP 50g is much smoother than using "RPN" on the HP PRIME. HP PRIME is not an "RPN" calculator 

05022021, 04:27 PM
(This post was last modified: 05022021 04:41 PM by OlidaBel.)
Post: #10




RE: Home screen, RPN, sum formula not updatable
(05022021 12:17 PM)robmio Wrote: Your method probably works in "Textbook" mode, not in "RPN" mode. In "RPN" mode your method works only if you first hit "shift" + parenthesis: ' '. Am I wrong? Sincerely, Roberto you're right ! thank you, now I see how to duplicate (pick), modify and run a formula in RPN. As said above, 1st type ' ', then double tap the stack line, edit, and Enter. The OS could communicate better on this point, as the text duplicate in the command line was HIS action...;) ! Or it could include ' ' silently when a formula line is copied to the command line.  HP 48GX, Prime G2, 50G, 28S. A long time ago : 11C, 15C, 28C. SwissMicros DM42, DM15L 

05022021, 04:29 PM
Post: #11




RE: Home screen, RPN, sum formula not updatable
(05022021 11:43 AM)toml_12953 Wrote: I didn't have to do any of that. All I did was press the up direction until the expression was highlighted, then hit enter. The expression appeared on the command line. I then moved to the 1000 and added a zero. Then I hit Enter again and the new expression was calculated. I'm using the 2.1.14575 (2021 04 28) Beta.my Prime is running the same release as yours. Textbook mode lets you do this, not the RPN mode.  HP 48GX, Prime G2, 50G, 28S. A long time ago : 11C, 15C, 28C. SwissMicros DM42, DM15L 

05022021, 06:22 PM
Post: #12




RE: Home screen, RPN, sum formula not updatable
(05022021 12:17 PM)robmio Wrote:(05022021 11:43 AM)toml_12953 Wrote: I didn't have to do any of that. All I did was press the up direction until the expression was highlighted, then hit enter. The expression appeared on the command line. I then moved to the 1000 and added a zero. Then I hit Enter again and the new expression was calculated. I'm using the 2.1.14575 (2021 04 28) Beta. Ah. I was in Algebraic mode. I never use RPN mode on the Prime since it's just kind of grafted on like an afterthought and not really an integral part of the calculator. Tom L Cui bono? 

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