Texas Instruments TITANIUM TI-89 User Manual

Page 673

Numeric Solver

673

Editing the Equation

In the Numeric Solver, press

C until the cursor is on the equation. The screen

automatically changes to show only the

eqn:

line. Make your changes, and then press

¸ or D to return to the list of variables.

Specifying an Initial Guess and/or Bounds (Optional)

To find a solution more quickly or to find a particular solution (if multiple solutions exist),
you can optionally:

•

If you see the error shown to the right,
delete the entered variable value. Then
edit the equation to use a different
variable.

Note:

This error occurs if you use a

reserved name incorrectly or refer to an
undefined system function as a simple
variable without parentheses.

•

Enter an initial guess for the unknown
variable. The guess must be within the
specified bounds.

•

Enter lower and upper bounds close to
the solution.

For example, y1(x) is
undefined and you
use y1.

Initial guess must be
within the bounds.