Baffling. These companies (Casio and Texas Instruments, particularly) and all their marketing games are confusing. Sorry to hear those are missing from the 991ES -- thank you for letting others know. It is the first time I have ever heard of an actual difference between the 115ES and the 991ES -- I incorrectly assumed they were just different names for the same device based on historical/marketing reasons.
They all do the same right? I don’t mind if one is slower but I need one for physics class. Are they all the same or do they have different ways of doing the same calculation?
The three calculators in the video are very similar in terms of how they function. There are slight differences, but they are subtle. Any of the 3 would be good for physics class. The speed difference is insignificant for any typical calculation you will do in physics. This video goes into more detail if you are curious: ru-vid.com/video/%D0%B2%D0%B8%D0%B4%D0%B5%D0%BE-6J_ehPTc0hw.html
@@scottcollins7513 thanks, i first tried the fx 115 and the blue tinted screen with the low quality made me return it. Unfortunately the 991 ex is not being made anymore and I had to get the 991 ES, it’s basically an upgrade right even though it looks cheaper?
@@atFanta The 991CW is the replacement for the 991EX (in the US) -- www.casio.com/us/scientific-calculators/product.FX-991CW/ 115ES PLUS 2nd edition is replacement for 115ES PLUS (in the US). The 991ES is extremely similar to the 115ES, but there might be slight differences in functions. Bottom line is that you have a solid calculator in the 991ES that should serve you very well. I have not personally tried the 991CW.
Thankyou so much for this, i used a 991EX and i gave it to my sis and bought a115ES plus and i felt bad about buying the wrong one(i wanted the 991EX) but now i feel way better with my calculator! Thanks again!
Hang in there. You may not end up liking it better in the end, but you definitely need to put in enough time til the approach "clicks" for you. Then you can make a decision on whether or not RPN is for you. Good for you for trying something new! Good for your mind, too.
Coming from a current racer operator it’s so fun to see the vibes in coney from 35+ years ago, how much has changed and how much is the same. The rides office is so similar too haha
Very fun to hear from someone who is currently working Racer. Hope you had and are having a great summer. My buddy and I that made that video met on the job at the Racer in the summer of 1988 and still hang out regularly to this day. Many great memories of KI. All the best.
Totally agree. From my situation, I do a lot of CAS math in controller design, if I use the 48, I need to write down every step and value carefully for some review of the procedure, and bear with its grandma speed. However, Prime revolutionizes this experience, its algebraic style makes the whole procedure smooth and easy to review, and it is so fast, I think Prime represents a modern level of a handheld calculator can achieve with so many years' accumulation, meanwhile 48gx also represents his status at 1990s, they are all kings. I love RPN, it needs you to think more about the math. hope there could be some evolution products on the basis of HP48 with a modern hardware platform.
Appreciated reading your thoughts in the comment and your use case for the Prime. The Prime is blazing fast, but I never warmed up to it, since I do not really have a need for that kind of power. I think RPN is forever relegated to the "enthusiast" market (e.g. SwissMicros), but I still love it.
Thank you, John. Would have been nice to have had better audio quality (I forgot to turn off the fan), but I'm glad you still were able to enjoy the content. Thanks for the encouraging words.
I am still really impressed that a $20 calculator can do this. Glad you left a comment and good reminder that the results are auto-stored in the x variable.
@@scottcollins7513I now tested the TI30X Pro over the last to days and just wantes to give you feedback. I will Return the 30X pro for several reasons (all compared to my beloved fx991DE X). I think the 991 has a much more intuitive Overlay, allthough I like that on the 30X you can do imaginary Numbers in the Same Menu as normal calculation. TI30X only Features 3x3 Matrix, while 991 Features 4x4. The pressure points of the Buttons are catastrophic on the TI in my opinion, sometimes it feels I dont press the Buttons at all. Also in terms of readability, due to the bigger screen on the fx is a lot better there too. What I also hate is that you have Double functions on One Button, so you have to cycle all variables, while on the fx I can just put them behind each other without multiplication Symbols. Square Root unter 2nd makes also no sense in my opinion. Last Point is the default replace Mode and not the insert Mode from the fx, with a cursor that looks so much better. Actually the only advantage of the TI is the copy Paste Feature together with the Memory that dont delete after turning off the calculator. I Hope Casio will add it someday.
None that I am aware of -- in fact, this seems to be something people dislike about a generally well-liked calculator. The TI-36X Pro and TI-30X Pro MathPrint maintain calculation history even after being powered off. Here's a video I made about the latter -- ru-vid.com/video/%D0%B2%D0%B8%D0%B4%D0%B5%D0%BE-KcN9guPLwRQ.html
I guess I wanted to show something that I had found helpful, but I can see why it would be frustrating in your situation where you are just trying to use it without any modifications. Were you able to get the solver working yet? If not, I could see if I can find info to help or possibly even make my own short video. Let me know.
@@scottcollins7513 Thank you for replying. My feedback is that many people watch your videos to learn, so keeping the standard settings is important for them to replicate the steps and understand how it works. Thanks.
Yes. Hit the DEL key once. All of this type of calculator (TI-36X Pro, Casio fx-991EX, etc.) are capable of editing the line before it is executed (by hitting the = key).
You can use the initial guess for x to increase the likelihood of it finding the other answer. Alternatively, you can use the quadratic solver to find both roots.
That is impressively efficient. Thank you for leaving a comment and for bringing this calculator to my attention -- I know nothing about this calculator, so I plan to watch some videos on it. Cheers.
It is giving you the correct answer (not sure why you have a zero in front of the 2, but it's technically still the correct answer). The L-R=0 is just the calculator telling you that it found an answer where the difference between the Left and Right sides of the equation are equal -- in other words it found an answer.
QUESTION FOR SCOTT....the TI36x Pro does complex numbers, and matrices, but it does NOT do matrices OF complex numbers. Does the TI30x Pro do that??? This would be very nice for solving circuits in Elect Engg if it did. Thanks, please let us all know in the comments...Cheers, Joe
Sadly, Joe, it cannot handle complex numbers within a matrix. I just tried putting an "i" into the matrix and rec'd the message "Error - Input must be Real".
The spreadsheet mode is such a life saver for me. Its saves me minutes of time spent on doing tabulated calculations. It's my favourite mode to use in an exam
I absolutely love the 991 ex it feels like my best investment worth every penny. It's sad the upgraded version to this much loved boy didn't get as good response. Nonetheless I will get a 991 CW anyways I just don't want to miss on the update to spreadsheet mode which keeps the data intact even when changing mode unlike what it's like in the EX
