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Sharp EL-W516X Calculation Examples Manual
05-21-2014, 10:26 PM (This post was last modified: 05-21-2014 10:27 PM by Matt Agajanian.)
Post: #41
RE: Sharp EL-W516X Calculation Examples Manual
(05-21-2014 07:50 PM)lrdheat Wrote:  Last night, I tried an f(x) that I had in table, and tried, in num-solve, 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, num-solve works! The TI 36pro is truly a $20 dollar pocket wonder.

This works on the HP 39gii as well.

The Prime, of course, is a pocket wonder. I set the display at lowest brightness now so that the battery life will be lengthier.

Could you please give an example of this? That way I can see how this works. Thank you.
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05-22-2014, 02:14 AM
Post: #42
RE: Sharp EL-W516X 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 num-solv 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!
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05-22-2014, 02:30 AM
Post: #43
RE: Sharp EL-W516X 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!
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05-22-2014, 04:17 AM
Post: #44
RE: Sharp EL-W516X Calculation Examples Manual
Thanks for the techniques. Tried 'em and they work. Although, grabbing the 'f(' string from Table and putting that in the Num-solve equation screen is a bit temperamental. Sometimes it works; sometimes it doesn't and I need to rewrite the right side of the num-solv' equation. I wonder if Classic/Math Print has something to do with that.
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