Sharp ELW516X Calculation Examples Manual

05212014, 10:26 PM
(This post was last modified: 05212014 10:27 PM by Matt Agajanian.)
Post: #41




RE: Sharp ELW516X Calculation Examples Manual
(05212014 07:50 PM)lrdheat Wrote: Last night, I tried an f(x) that I had in table, and tried, in numsolve, to see if I could use an integral in that application. It worked! If you wish solve an integral from or to a given value, and wish to know what the other value that fills out the range for the integration so that the result equals some desired value, numsolve works! The TI 36pro is truly a $20 dollar pocket wonder. Could you please give an example of this? That way I can see how this works. Thank you. 

05222014, 02:14 AM
Post: #42




RE: Sharp ELW516X Calculation Examples Manual
Hi Matt,
Let's say, in table, I go to choice 2 and make f(x)=(x^2+x+1)/x^(1/2). The 36Pro really "wants" one to enter terms in classic mode, not pretty print. Also wants fractional powers, not the n root key. I want to find the integral of f(x) from 1 to ? such that the integral=10. Go to numsolv and make it 10=Integral from 1 to x of f(x). To accomplish this, place curser inside of (),hit table, choose choice 1 which will make the integrand (f()dx. Make it (f(x)), put curser beyond the dx, press enter. This sends you to the solve template. Choose a reasonably sounding "x". Go to solve field, highlight x, enter. Making a table first (by selecting choice 2 after choosing table) may assist you in making a reasonable guess as this will effect calculation time. When I chose 1 as my guess, it came up with the correct 2.987+ in 54 seconds. When I made a more unreasonable guess of 10, it took 2 minutes 53 seconds. It looks fairly forgiving if your guess is fairly good...remember the guess of "1" took 54 seconds. An excellent guess of 3 took 40 seconds. None of this is documented in their little guide book. I gave the d/dx and the integral a shot in solve as it didn't say that it couldn't be done...wonder why they (TI) didn't share this as it makes the calculator much more useful in simple calculus! 

05222014, 02:30 AM
Post: #43




RE: Sharp ELW516X Calculation Examples Manual
I just reread earlier part of this thread on page 1 and see that CR Haeger made a related discovery, that can also be used to make a table...also useful!


05222014, 04:17 AM
Post: #44




RE: Sharp ELW516X Calculation Examples Manual
Thanks for the techniques. Tried 'em and they work. Although, grabbing the 'f(' string from Table and putting that in the Numsolve equation screen is a bit temperamental. Sometimes it works; sometimes it doesn't and I need to rewrite the right side of the numsolv' equation. I wonder if Classic/Math Print has something to do with that.


11112022, 11:05 PM
(This post was last modified: 11122022 12:40 AM by Matt Agajanian.)
Post: #45




RE: Sharp ELW516X Calculation Examples Manual
(04112014 03:25 PM)CR Haeger Wrote:(04112014 02:50 PM)lrdheat Wrote: Just discovered an interesting item that the TI 36pro can do that the CASIO fx115ES PLUS cannot do...the Casio cannot include a d/dx in a solve problem. The TI can! Enter solve, enter the d/dx, set where x equal to x, enter a guess for x, solve for x, and you get an answer for x when d/dx=0 which will be a min or max of f(x). The variable x now has the number that solve arrived at. If you type in the equation and enter it, you get the value of f(x) at that point. Nicely, since x root of y is available, answers are available for negative numbers where something like 3 root of x is involved. Hi. Got it figured out! Sorry for the mixup. 

11122022, 04:23 AM
Post: #46




RE: Sharp ELW516X Calculation Examples Manual
(04132014 06:06 PM)lrdheat Wrote: A simple example...press table, select choice 2, press clear, and type in the function, shay, sin(x). Hit enter. This takes you to the table setup. You can directly go to numsolve from this screen by pressing 2nd numsolv. Here, you can make 0=d/dx. With curser inside of (), press table, enter choice 1. This brings you back to the numsolv screen. Type an x inside (), makex=x. This takes you to solve. Try x=1, go down to solve and highlight x and enter. It will come up with ~1.57 if in radians. Quit. This puts you in home screen. Type x and enter, getting ~1.57. Press table, enter choice 1. This brings back the home screen. Type x so that you have f(x) and enter, and you will get f(x)=1 which is f(~1.57). For which calculator are these steps? 

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