Texas Instruments PLUS TI-89 - Manual (Page 473)

456 Appendix A: Functions and Instructions
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 456 of 132
4 Hex MATH/Base menu
integer1 4 Hex ⇒ integer
Converts integer1 to a hexadecimal number.
Binary or hexadecimal numbers always have
a 0b or 0h prefix, respectively.
256 4Hex ¸ 0h100
0b111100001111 4Hex ¸ 0hF0F
0b binaryNumber
0h hexadecimalNumber
Without a prefix, integer1 is treated as
decimal (base 10). The result is displayed in
hexadecimal, regardless of the
Base mode.
If you enter a decimal integer that is too large
for a signed, 32-bit binary form, a symmetric
modulo operation is used to bring the value
into the appropriate range.
identity() MATH/Matrix menu
identity( expression ) ⇒
matrix
Returns the identity matrix with a dimension
of
expression .
expression must evaluate to a positive integer.
identity(4) ¸





 1 0 0 0
0 1 0 0
0 0 1 0
0 0 0 1
If CATALOG
If Boolean expression If Boolean expression Then
statement block
EndIf
If Boolean expression evaluates to true,
executes the single statement statement or the
block of statements block before continuing
execution.
If Boolean expression evaluates to false,
continues execution without executing the
statement or block of statements.
block can be either a single statement or a
sequence of statements separated with the “:”
character.
Program segment:
©
:If x<0
:Disp "x is negative"
©
—or—
©
:If x<0 Then
: Disp "x is negative"
: abs(x)! x
:EndIf
©
If Boolean expression Then
block1
Else
block2
EndIf
If Boolean expression evaluates to true,
executes block1 and then skips block2 .
If Boolean expression evaluates to false, skips
block1 but executes block2 .
block1 and block2 can be a single statement.
Program segment:
©
:If x<0 Then
: Disp "x is negative"
: Else
: Disp "x is positive or zero"
:EndIf
©
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.