Texas Instruments TI-89 사용자 설명서

Additional Graphing Topics

475

•

Execute the

ClrGraph

command (available from the Home screen’s

†

Other

toolbar

menu).

– or –

•

Display the Y= Editor. The next time you display the Graph screen, it will use the
functions selected on the Y= Editor.

Extra Benefits of User-Defined Functions

You can define a user-defined function in terms of any independent variable. For
example:

and:

Graphing a Piecewise Defined Function

To graph a piecewise function, you must first define the function by specifying
boundaries and expressions for each piece. The

when

function is extremely useful for

Define f1(aa)=1.25aa

cos(aa)

Graph f1(x)

Define f1(aa)=1.25aa



cos(aa).

Refers to the function by using the native
independent variable.

Define f1(aa)=1.25aa

cos(aa)

f1(x)

y1(x)