Calculator User Manual

78
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
y2
would equal 4 plus the sine of x.
♦
To enter a function name, select
y
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
y1
,
y3
, and
y5
, 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
.