Clear Stack (CLST, CLSTK) and LastX

03162015, 07:03 AM
Post: #21




RE: Clear Stack (CLST, CLSTK) and LastX
(03162015 06:28 AM)Thomas Klemm Wrote: 23 apples @ $0.43 I see this as something near $10 + $7.99, my misspent youth playing too many card games helped here since 3*17 is rather related to a deck of cards A few seconds' further contemplation gives me the $17.88 answer but it isn't close to instantaneous. On a calculator I would have used the ENTER key for this one. If you went to three or four digit numbers, I'd reach for a calculator sooner of course. An arithmetic savant I'm not and the many amazing records of mental arithmetic are in no danger of being beaten by myself. You could calculate this as: 529 SQRT 43 * 289 SQRT 47 * + which is a bit convoluted but only because I didn't bother with square numbers much beyond thirty. And finally, the big question: what are you using 23 apples and 47 eggs for????? Pauli 

03162015, 07:27 AM
(This post was last modified: 03162015 07:27 AM by toml_12953.)
Post: #22




RE: Clear Stack (CLST, CLSTK) and LastX
[quote='Thomas Klemm' pid='30756' dateline='1426483232']
Quote:I wonder how you calculate 7*9+3*13 with your method. This works on the 35s: 7 STO A 9 * 3 STO A 13 * + Tom L Tom L Cui bono? 

03162015, 07:32 AM
Post: #23




RE: Clear Stack (CLST, CLSTK) and LastX  
03162015, 07:35 AM
Post: #24




RE: Clear Stack (CLST, CLSTK) and LastX  
03162015, 07:56 AM
Post: #25




RE: Clear Stack (CLST, CLSTK) and LastX  
03162015, 07:59 AM
(This post was last modified: 03162015 09:21 AM by Paul Dale.)
Post: #26




RE: Clear Stack (CLST, CLSTK) and LastX
So we should have a top level NOP key to replace ENTER???
Seems rather pointless. Pauli 

03162015, 08:12 AM
Post: #27




RE: Clear Stack (CLST, CLSTK) and LastX
Hi all,
This discution is very interesting but i thing that "Lastx" is very usefull and helpfull for correcting mistakes or store value "indirectly". Since my first hp 25 in 1976 to hp 50g (and Prime, of course), i have hundreds routines which have almost all "Lastx" inside. Hp 50g have "Lastarg" wich is a bit different, with obligation using "drop" to convert to "Lastx". I'm happy that WP 34s has the "Rcl L" exactly similar "Lastx". Gérard. Gérard. 

03162015, 09:03 AM
Post: #28




RE: Clear Stack (CLST, CLSTK) and LastX
(03162015 07:59 AM)Paul Dale Wrote: So we should behave a top level NOP key to replace ENTER??? Of course it is. But someone felt compelled to explain how to use RPN... Greetings, Massimo +×÷ ↔ left is right and right is wrong 

03162015, 09:15 AM
Post: #29




RE: Clear Stack (CLST, CLSTK) and LastX  
03162015, 09:29 AM
Post: #30




RE: Clear Stack (CLST, CLSTK) and LastX
(03162015 07:56 AM)Thomas Radtke Wrote: More Marcuslike: It's easy to find a sequence where you need more keystrokes than the obvious: 7 ENTER 9 * 3 ENTER 13 * + Don't ever try to calculate something more advanced like: \(\frac{(7\times9 + 3\times13)(4\times17+6\times7)}{9\times11+13\times5}\) Cheers Thomas 

03162015, 09:40 AM
Post: #31




RE: Clear Stack (CLST, CLSTK) and LastX  
03162015, 09:48 AM
(This post was last modified: 03162015 09:56 AM by Paul Dale.)
Post: #32




RE: Clear Stack (CLST, CLSTK) and LastX
\( \forall x \geq 0: x \equiv (\sqrt{x})^2 \)
So using three extra keystrokes per number (√, shift & x^{2}), we're home and hosed.  Pauli 

03162015, 09:52 AM
Post: #33




RE: Clear Stack (CLST, CLSTK) and LastX  
03162015, 09:58 AM
Post: #34




RE: Clear Stack (CLST, CLSTK) and LastX
Bummer, left out the ≥0 which I meant to include.
Fixed now. The problem with the √ is that it is two valued  both positive and negative.  Pauli 

03162015, 10:13 AM
(This post was last modified: 03162015 10:17 AM by Thomas Klemm.)
Post: #35




RE: Clear Stack (CLST, CLSTK) and LastX
(03162015 09:29 AM)Thomas Klemm Wrote: \(\frac{(7\times9 + 3\times13)(4\times17+6\times7)}{9\times11+13\times5}\) (03162015 09:40 AM)Thomas Radtke Wrote: Yes, but looking at the various methods can be fun. On the HP48 I don't need an [ENTER] key: 7 9× 3 13× + 4 17× 6 7× + * 9 11× 13 5× + ÷ Cheers Thomas 

03162015, 10:16 AM
Post: #36




RE: Clear Stack (CLST, CLSTK) and LastX  
03162015, 10:30 AM
Post: #37




RE: Clear Stack (CLST, CLSTK) and LastX  
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