Texas Instruments TI-89 Titanium User Manual

Appendix A: Functions and Instructions 783
0b binaryNumber
0h hexadecimalNumber
Without a prefix, integer1 is treated as decimal. The
result is displayed in decimal, regardless of the
Base mode.
Define CATALOG
Define funcName ( arg1Name, arg2Name, ... ) =
expression
Creates funcName as a user-defined function. You
then can use
funcName () , just as you use built-in
functions
. The function evaluates expression using
the supplied arguments and returns the result.
funcName cannot be the name of a system variable
or built-in function.
The argument names are placeholders; you should
not use those same names as arguments when you
use the function.
Note: This form of
Define is equivalent to executing
the expression:
expression ! funcName ( arg1Name,arg2Name ) .
This command also can be used to define simple
variables; for example,
Define a=3 .
Define g(x,y)=2xì 3y ¸ Done
g(1,2)
¸ ë 4
1! a:2! b:g(a,b)
¸ ë 4
Define h(x)=when(x<2,2x-3,
ë 2x+3)
¸ Done
h(ë 3)
¸ ë 9
h(4)
¸ ë 5
Define eigenvl(a)=
cZeros(det(identity(dim(a)
[1])-xù a),x)
¸ Done
eigenvl([ë 1,2;4,3])
¸
{
2ø 3 - 1
11
ë (2ø
3 + 1)
11
}
Define funcName ( arg1Name, arg2Name, ... ) = Func
block
EndFunc
Is identical to the previous form of Define , except
that in this form, the user-defined function
funcName () can execute a block of multiple
statements.
block can be either a single statement or a series of
statements separated with the “:” character.
block
also can include expressions and instructions (such
as
If , Then , Else , and For ). This allows the function
funcName () to use the Return instruction to return a
specific result.
Note: It is usually easier to author and edit this form
of Function in the program editor rather than on the
entry line.
Define g(x,y)=Func:If x>y Then
:Return x:Else:Return y:EndIf
:EndFunc
¸ Done
g(3,ë 7)
¸ 3
A binary number can have up to
32 digits. A hexadecimal number
can have up to 8.
Zero, not the letter O, followed by b or h.

Texas Instruments TI-89 Titanium Specifications

General

Brand	Texas Instruments
Model	TI-89 Titanium
Category	Calculator
Language	English