Sharp EL-W516X Calculation Examples Manual

[Matt Agajanian]

(04-13-2014 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 num-solve from this screen by pressing 2nd num-solv. Here, you can make 0=d/dx. With curser inside of (), press table, enter choice 1. This brings you back to the num-solv screen. Type an x inside (), make|x=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).

Of course, making a table can be neat also, and can help with choosing a guess to enter into the solver.

I did find an example that the 36pro balks at in num-solve for finding d/dx=0. This came from hp 15 guide book page 184. The pro36 comes up with domain error when solving d/dx=0 for 5000*(1-e^(-x/20))-200*x. It does make a table without difficulty. Not sure why this happens. The pro36 wasn't bothered with d/dx= for odd number roots where x<0 that I tried...seems like the pro36 solves a good many d/dx=0 functions.

Good luck!

Thanks for the step-through.


Now the question as to which direction Num Solve, looks for a root:

As the 34C, 15C and onward look at the bracket values in the X & Y registers (if I remember correctly), when a single guess value is set in the 36X Pro's num-solve dialog, in what direction does the solver search for a solution?