Texas Instruments TI-89 Titanium User Manual

Differential Equation Graphing 431
Example
For a general solution, use the following syntax. For a particular solution, refer to the
Technical Reference module.
deSolve(1stOr2ndOrderODE, independentVar, dependentVar)
Using the logistic 1st-order differential equation, find the general solution for y with
respect to t.
Notes:
• For maximum accuracy, use 1/1000 instead of .001. A floating-point number can
introduce round-off errors.
• This example does not involve graphing, so you can use any Graph mode.
deSolve(y' = 1/1000 yù(100Ny),t,y)
Do not use implied multiplication between the
variable and parentheses. If you do, it will be
treated as a function call.
For ', type 2È.

Texas Instruments TI-89 Titanium Specifications

General

Display Type	LCD
Display Resolution	160 x 100 pixels
CPU	Motorola 68000
CPU Speed	16 MHz
RAM	256 KB
Flash ROM	2.7 MB
Programming Language	TI-BASIC, Assembly
Power Source	4 AAA batteries
Connectivity	I/O port
Dimensions	7.5 x 3.5 x 1 inches