Setting Up The Interactive-Solver Editor; Entering Variable Values; Controlling The Solution With Bounds And A Guess - Texas Instruments TI-86 Manual Book

204
Chapter 15: Equation Solving
In the example, the equation
was
V1=V(R1à(R1+R2))
entered in the equation-entry
editor.
If you entered an expression
for , then is the first
eqn exp=
variable prompt on the
interactive-solver editor.

Setting Up the Interactive-Solver Editor

After you have stored an equation to
editor, press b to display the interactive-solver editor.
The equation is displayed across the top of the editor.
Each variable in the equation is displayed as a prompt.
Values already stored to variables are displayed; undefined
variables are blank. The solver menu is displayed on the
bottom of the editor (page 206).
is a list containing the default lower bound (
bound={L1E99,1E99}
bound ( ). You can edit the bounds (below).
1E99

Entering Variable Values

To solve for an unknown variable, you must define every other variable in the equation.
When you enter or edit a variable value in the interactive-solver editor, the new value is
stored to the variable in memory. For any variable, you may enter an expression, which is
evaluated when you press b, #, $, or .. Expressions must resolve to real numbers
at each step of the calculation.

Controlling the Solution with Bounds and a Guess

The solver seeks a solution only within the specified bounds. Whenever you display the
interactive-solver editor, the default
maximum bounds for the TI-86.
in the equation-entry
eqn
is displayed. These are the
bound={L1E99,1E99}
) and the default upper
L1E99