Appendix A: Functions and Instructions 433
8992APPA.DOC TI-89 / TI-92 Plus: Appendix A (US English) Susan Gullord Revised: 02/23/01 1:48 PM Printed: 02/23/01 2:21 PM Page 433 of 132
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)=2xì3y ¸Done
g
(1
,2
)
¸
ë4
1
!a:2!
b
:g
(
a,
b)
¸
ë4
Define h(x)=when(x<2,2x-3,
ë2x+3
)
¸
Done
h(
ë3
)
¸
ë9
h(
4
)
¸
ë5
Define eigenvl(a)=
cZeros
(d
et
(
i
d
entity
(d
im
(
a
)
[1])-xùa),x) ¸Done
eigenv
l([
ë
1
,2;4,3
])
¸
{2ø3 - 1
11
ë(2ø3 + 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,ë7) ¸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.