CASIO fx991CW

03302023, 12:59 AM
Post: #41




RE: CASIO fx991CW
(03292023 09:56 PM)thenozone Wrote: ... none of the English models I have seen so far have the periodic table that some have been looking out for. ... As I posted above, the Japanese version is readily available via Amazon, has the Periodic Table function, and can display in English. It's just kinda expensive... 

03302023, 05:43 AM
(This post was last modified: 03302023 05:44 AM by Csaba Tizedes.)
Post: #42




RE: CASIO fx991CW
... and multistatement ( : ) missing also.
(03292023 03:16 PM)Csaba Tizedes Wrote: In the fx991CW THERE IS NO CALC!!! 

03312023, 12:13 PM
Post: #43




RE: CASIO fx991CW
(03292023 03:16 PM)Csaba Tizedes Wrote: In the fx991CW THERE IS NO CALC!!! On 570CW, num solver can also accept other variable like A, B, C... Which error did you get? S.Korean / HP50G  fx570EX  fx570CW  HP200LX 

04012023, 12:28 PM
Post: #44




RE: CASIO fx991CW  
04012023, 12:47 PM
Post: #45




RE: CASIO fx991CW
Another bug: STO and RECALL removed. Type in some statistical data. Do statistical analysis, then try to store ANY calculated value (mean, variance, etc...) to variables. You can't. Only via Ans.


04012023, 02:58 PM
Post: #46




RE: CASIO fx991CW
(04012023 12:47 PM)Csaba Tizedes Wrote: Another bug: STO and RECALL removed. Type in some statistical data. Do statistical analysis, then try to store ANY calculated value (mean, variance, etc...) to variables. You can't. Only via Ans. You can do this. Look at manual p75~p77 for get statistics data, p36~37 for using Variables. S.Korean / HP50G  fx570EX  fx570CW  HP200LX 

04012023, 05:25 PM
Post: #47




RE: CASIO fx991CW
Received my 991CW this morning.


04022023, 04:08 AM
(This post was last modified: 04022023 04:17 AM by Eddie W. Shore.)
Post: #48




RE: CASIO fx991CW
Storing Numbers in Solver
The Solver can solve for any variable, not just x. Store values in other variables through the [VARIABLE] key. Example: A^2+B^2=C^2 If A = 5 and C = 13, solve for B. [ HOME ], Equation Select Solver Type A^2+B^2=C^2, press [ EXE ] At the Solve Target screen, select B Store 5 in A by pressing [VARIABLE], select A, [ OK ], Edit, entering 5, [OK] (we're back to the variable screen) Store 13 in C by selecting C, [ OK ], Edit, entering 13, [ OK ] Press [ undo ] to get back to the Enter Initial Value Screen. Select Execute to solve for B. B = 12, LR = 0 Storing Statistical Results Again, storing is through the [VARIABLE] key. Example: Store Σx in E and Σx^2 in F through the following data: 12.3 13.6 14.9 18.8 Enter data in 1varaible statistics. Press [ EXE ], select Statistics Calc. Recall Σx by [CATALOG], Statistics, Summation, Σx, [ EXE ], [ EXE ] (twice) [VARIABLE], select E, [ OK ], Store (59.6 is stored in E) Recall Σx^2 by [CATALOG], Statistics, Summation, Σx^2, [ EXE ], [ EXE ] (twice) [VARIABLE], select E, [ OK ], Store (911.7 is stored in F) Values stored in variables are retained until cleared by a reset or a new value replaces the old value. Other I do miss the ALPHA key and the independent variable M/M+/M. I would have been nice to store custom functions assigned to the shifted functions of [ × ] and [ ÷ ]. 

04022023, 11:37 AM
Post: #49




RE: CASIO fx991CW
Yeah, the SOLVE can solve for ANY variable if those variables are typed directly. But can't if those variables are come from f() or g() definition as I wrote above.
This storage of statistics registers is not direct storage. Just grab your 991EX and check: you can store these variables like sx STO E, etc... When you press TWICE the EXE, on 991CW you made a copy of VALUE of that stat register. And after this, the copy of value can be stored. This value probably the ANS, must to check. And multistatement is missing. Maybe you're more tolerant, I guess, this is come from the cultural differences and you're only collectors, but I'm member of CASIO Educators and I must to look these glitches as backward steps, as a serious user of these machines. I have 40+ educational video about 991CEX, how you can explain these stupid "updates" if 991EX cancelled and this bad designed "thing" will be use in the schools?! Cs. CASIO fx991CEX  a leghatékonyabb Classwiz Akcióban  CASIO fx991CEX  the most powerful Classwiz in ACTION: https://www.youtube.com/playlist?list=PL...ons3wS2cef 

04022023, 01:48 PM
Post: #50




RE: CASIO fx991CW
I tried the f(x) in the solver and I can confirm that the solver does not include the other variables with that method.
As I said before, I prefer the ALPHA key. I will go one step further and advocate that storage arithmetic (like the HP/Swiss Micros calculators) should be included. I think this is the most efficient way to do it. When the Casios had the multistate command, storing calculations immediately terminated the entry: pi^2/6 [ STO ] A (terminated) A^2 / (A + 1) Ans could be used: pi^2/6: Ans^2/(Ans+1) For the fx115ES Plus (1st or 2nd Edition), we could use both Ans and PreAns. 

04022023, 04:29 PM
Post: #51




RE: CASIO fx991CW
(04022023 01:48 PM)Eddie W. Shore Wrote: When the Casios had the multistate command, storing calculations immediately terminated the entry ... Ans could be used ... For the fx115ES Plus (1st or 2nd Edition), we could use both Ans and PreAns. Of course you can use the following structure: Code: var1=expression1:var2=expression2: ... etc Then press CALC (which is removed from 991CW ) This is same as STO but without entry cancellation. Check this video (How to emulate IF...THEN structure on CASIO fx991EX): 

04042023, 04:40 AM
Post: #52




RE: CASIO fx991CW
I like this calculator! I can define g(x) to be d/dx of f(x), create a table for both to find where extremums are nearby, then use the solver to find g(x)=0, save the solution into, say, A, go to calculate app, enter f(A) to find the extremum! I can find roots of f(x), save them into variables and then integrate from one saved variable to the next to find the area under the curve between roots. Another neat deal is that the calculator uses 1722 internal digits meaning that the answer will come out to an actual fraction instead of a repeating decimal when the 991EX, or even the fxCG50 will show the repeating decimal. When integrating an improper integral such as 1/sqrt(x1) from 0 to 1, the 991EX allows a calculation when the upper end of the interval is 11*10^12. The 991CW allows 11*10^18 to be used, resulting in a much better approximation for such an integral. One needs to download the manual to understand how to access/enter functions, but it is easy, makes sense rather quickly. I like that f(x), g(x) is accessible in the calculate app. The stats app is good as well as the distribution app. Still much more to explore!


04042023, 04:58 AM
Post: #53




RE: CASIO fx991CW
I meant integral from 0 to 1 of 1/sqrt(1x). The answer using upper end as 11*10^18 comes out as 1.999999998 which is very close to the answer of 2.


04042023, 05:21 AM
(This post was last modified: 04122023 01:46 PM by Eddie W. Shore.)
Post: #54




RE: CASIO fx991CW
My review of the Casio fx991CW: http://edspi31415.blogspot.com/2023/04/r...multi.html
The original post is no longer available, this is the updated link (4/12/2023). 

04042023, 05:49 AM
Post: #55




RE: CASIO fx991CW
And what is your opinion/advice for CALC? Maybe TABLE? But TABLE works only if you define f() or g() and you lost actual f() or g(). The CALC asked each variables during calculation, TABLE is not, like SOLVE also, it is required to type each variables onebyone in Variables menu...Clumsy... Not straightforward.


04042023, 08:29 PM
Post: #56




RE: CASIO fx991CW
(04042023 05:21 AM)Eddie W. Shore Wrote: My review of the Casio fx991CW: http://edspi31415.blogspot.com/2023/04/r...991cw.html Nice, quick review. Thanks! BTW, has your dog been chewing your fingers? — Ian Abbott 

04042023, 09:04 PM
Post: #57




RE: CASIO fx991CW
if someone has willing and has spare time, one could try the summation benchmark here: https://www.hpmuseum.org/forum/thread9750.html
Wikis are great, Contribute :) 

04052023, 12:41 PM
Post: #58




RE: CASIO fx991CW
(04042023 08:29 PM)ijabbott Wrote:(04042023 05:21 AM)Eddie W. Shore Wrote: My review of the Casio fx991CW: http://edspi31415.blogspot.com/2023/04/r...991cw.html Thank you. No, it's a paper cut. 

04052023, 01:02 PM
Post: #59




RE: CASIO fx991CW
(04042023 09:04 PM)pier4r Wrote: if someone has willing and has spare time, one could try the summation benchmark here: https://www.hpmuseum.org/forum/thread9750.html Casio fx991CW: Σ( ³√[e^(sin(tan^1(x)))], x=1 to 1000) Result: 1395.346288 Time: approx. 57 seconds I posted the result on the benchmark thread. 

04052023, 04:22 PM
(This post was last modified: 04052023 07:47 PM by Csaba Tizedes.)
Post: #60




RE: CASIO fx991CW
(04042023 05:21 AM)Eddie W. Shore Wrote: My review of the Casio fx991CW: http://edspi31415.blogspot.com/2023/04/r...991cw.html Quote:There is no longer the ability to use multistatement expressions, with each expression separated with a colon. Even when it was available, (1) storing results immediately terminated the expression (forcing the use of Ans and when available, PreAns to make using results in the next part possible), and (2) when replayed, the statement was broken up into separate parts. This is true, but you use multistatement in wrong way. And you do not checked the linked video Just few minutes and you can see multistatement how efficient. AND I'm sure if you try, you will surprised how easy to expand the possibilities and add an IF/THEN structure for a nonprogrammable calculator. Just try it: Code: Type in C=A+B:D=C/2 Cs. 

« Next Oldest  Next Newest »

User(s) browsing this thread: 1 Guest(s)