Notes about defining function equations – Texas Instruments TI-86 User Manual

Page 90

Chapter 5: Function Graphing

05FUNC.DOC TI-86, Chap 5, US English Bob Fedorisko Revised: 02/13/01 2:22 PM Printed: 02/13/01 3:01 PM Page 78 of 14

Notes about Defining Function Equations

♦

You can include functions, variables, constants, matrices, matrix elements, vectors,
vector elements, lists, list elements, complex values, or other equations in the equation.

♦

If you include matrices, vectors, or complex values, the equation must evaluate to a real
number at each point.

♦

You can include another defined function in an equation. For example, given

y1=sin x

and

y2=4+y1

, the function

would equal 4 plus the sine of x.

♦

To enter a function name, select

from the equation editor menu, and then enter the

appropriate number.

♦

To insert the contents of an equation variable, use

RCL

(Chapter 1). To enter the

equation variable at the

Rcl

prompt, use the ALPHA keys, alpha keys, and other

character keys.

♦

To select all functions from the home screen or in the program editor, select

FnOn

from

the

CATALOG

(or enter the individual characters) and press b.

♦

To select specific functions from the home screen or in the program editor, select

FnOn

from the

CATALOG

(or enter the individual characters), enter the number of each

function, and press b. For example, to select

, and

, enter

FnOn 1,3,5

♦

To deselect functions from the home screen or in the program editor, use

FnOff

the

same way you use

FnOn

to select functions.

♦

When a function evaluates to a non-real number, the value is not plotted on the graph;
no error is returned.

You can edit expressions you
inserted using Rcl.