
#37
Aug411, 10:54 PM

P: 2,490





#38
Aug411, 11:03 PM

Mentor
P: 7,289

My current calculator is a HP 28s. This is the first graphing calculator, on the market in 1986. Redbelly, Sorry for the loss of your dad. I too "collected" HP calculators in the '70's . I had the 35, a 25, 33,34, 71b and the 28. I never owned the greatest HP calculator the HP41c. 



#39
Aug411, 11:08 PM

P: 2,163





#40
Aug411, 11:09 PM

P: 1,035





#41
Aug411, 11:47 PM

P: 501





#42
Aug511, 05:50 AM

Sci Advisor
HW Helper
P: 2,275

My brain was smart enough to remember that your final answer shouldn't have more digits than the original numbers that went into the problem in the first place. Since the square root of 2 is less than 1.5 and I know the answer can't get below 1 no matter how many roots you take, that answer was pretty easy. Getting 9 digit answers when the numbers in the problem only had 1 significant digit is one of the drawbacks of calculators. Ever since the introduction of electronic calculators, just about every math or science course now needs to start with a chapter about significant digits. 



#43
Aug511, 06:18 AM

P: 753





#44
Aug511, 12:34 PM

P: 2,490





#45
Aug511, 03:37 PM

HW Helper
P: 6,189

*Sigh* 



#46
Aug511, 04:48 PM

Mentor
P: 11,984

When pi comes up in mathematics or theoretical physics, it is represented as [itex]\pi[/itex]. In engineering or experimental physics, 3.14 usually suffices. In neither case is an infinite number of digits required.




#47
Aug511, 07:40 PM

HW Helper
P: 930





#48
Aug511, 10:10 PM

P: 342

Thanks to it, I don't know how to solve integrals by myself anymore. == 



#49
Aug611, 04:45 PM

Admin
P: 21,625

HP41CX. I bought that during grad school, ca. 1982, and I still have and use it.
Before 1982 I had a TISR51 and TI58C. 



#50
Oct2711, 10:47 AM

P: 754

I've always been partial to Sharp calculators. The first calculator I ever had was a TI (natch). They were the only ones available when handhelds first came out  they had those awful red LED displays. In college, I found a Sharp EL512 which was around $30 and was programmable.
That was the beginning of my love affair with Sharp calculators. I have yet to find an inexpensive (< $20) calculator that I like that beats a Sharp. They have plenty of functions and (more importantly) their keyboards are generally laid out better than those of other companies. Later in college, I found that many of the "rich" students were using HP calculators with RPN. I found those intriguing and ended up buying an HP 32SII (also for around $30). It, too, is programmable, allowing for much more complex programs (albeit, with greater difficulty). After college, I found a newer Sharp to replace my trusty old EL512 which had broken. I got an EL520W for around $20 which has become my new favorite. It does everything I need (including complex numbers) and even does simple derivatives and integrals. A coworker had this horrible Casio calculator that was extremely difficult to use (even for simple calculations). I bought him a Sharp EL531X which is very similar to my EL520 (lacking some of the more complicated functions) for $10 at Office Depot. 



#51
Oct2711, 11:14 AM

Admin
P: 8,531

I used to have that Sharp in the first image zgozvrm! Good times!




#52
Oct2711, 05:56 PM

PF Gold
P: 1,153

My calculator:
When I'm not on a computer, I have a Ti84, though I just bought an HP50 to replace it. 



#53
Jan2012, 11:20 PM

P: 345

My HP28S has been serving me well for the past 23 years and has been my favourite calculator to use. Recently acquired a second one off ebay so that I'd have one for work and for home




#54
Feb1812, 09:18 PM

P: 64

Scientific calculator: TI30XS MultiView™



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