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.


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