Texas Instruments Titanium TI-89 User Manual

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2. Display and clear the Y= Editor. Then
define the 1st-order differential equation:
y1'(t)=.001y1…(100Ny1)
Press p to enter the … shown above. Do
not use implied multiplication between the
variable and parentheses. If you do, it is
treated as a function call.
Leave the initial condition
yi1 blank.
Note: With y1' selected, the device will
graph the
y1 solution curve, not the
derivative y1'.
Press 8 # , 8 ¸ ¸ .001 Y1
p c 100 | Y1 d ¸
3. Display the
GRAPH FORMATS dialog box.
Then set
Axes = ON, Labels = ON, Solution
Method = RK
, and Fields = SLPFLD.
Note: To graph one differential equation,
Fields must be set to
SLPFLD or FLDOFF.
If
Fields=DIRFLD, an error occurs when
you graph.
Press 8 Í D D B 2 D D B 2 D B 1
D B 1 ¸
Steps and keystrokes Display

Texas Instruments Titanium TI-89 Specifications

General

Display Type	LCD
Display Resolution	160 x 100 pixels
Memory	188 KB RAM, 2.7 MB Flash ROM
Type	Graphing Calculator
Display	Monochrome
Processor	Motorola 68000
Processor Speed	12 MHz
Power Source	4 AAA batteries
Connectivity	USB
Programming	TI-BASIC, Assembly
Operating System	AMS (Advanced Mathematics Software)