Texas-instruments PLUS TI-89 User Manual download pdf (Page 224)

100

101

Chapter 12: Additional Graphing Topics 207

12ADDLGR.DOC TI-89/TI-92 Plus: Additional Graphing Tools (English) Susan Gullord Revised: 02/23/01 1:03 PM Printed: 02/23/01 2:15 PM Page 207 of 20

For three or more pieces, you may want to create a multi-statement,

user-defined function.

For example, consider the previous three-piece function.

When: Use expression:

x <

4 sin(x)

‚

and

x < 0 2x + 6

‚

A multi-statement, user-defined function can have many of the

control and decision-making structures (

ElseIf

Return

, etc.) used

in programming. When creating the structure of a function, it may be

helpful to visualize it first in a block form.

Func

If x<-p Then

Return 4

sin(x)

ElseIf x>=-p and x<0 Then

Return 2x+6

Else

Return 6

x^2

EndIf

EndFunc

When entering a multi-statement function on the Y= Editor or Home

screen, you must enter the entire function on a single line.

Func:If x<-p Then:Return 4

sin(x): ... :EndIf:EndFunc

On the Y= Editor:

From the Home screen, you can also use the

Define

command to

create a multi-statement, user-defined function. Refer to page 204 for

other information on copying a function from the Home screen to the

Y= Editor.

From the Program Editor (Chapter 17), you can create a user-defined

function. For example, use the Program Editor to create a function

named

f1(xx)

. In the Y= Editor, set

y1(x) = f1(x)

Using a Multi-

Statement, User-

Defined Function

Note: For information about

similarities and differences

between functions and

programs, refer to

Chapter 17.

Tip:

Graph math results

may vary.

From the Home

Screen or a Program

Enter a multi-statement

function on one line. Be

sure to include colons.

Only “Func” is shown

for a multi-statement

function.

Func

and

EndFunc

must begin and end the

function.

For information about

the individual

statements, refer to

Appendix A.

Use a colon (:) to separate each statement.

1 2 ... 219 220 221 222 223 224 225 226 227 228 229 ... 622 623

Comments to this Manuals

No comments

Texas-instruments PLUS TI-89 User Manual Page 224

Comments to this Manuals

Related products and manuals for Calculators, organizers Texas-instruments PLUS TI-89