Hp 48g Graphing Calculator Uživatelský manuál Strana 235

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Step 1: Select PLOT Diff Eq mode, enter the equation, set the
independent variable to T, and set the initial and final
values:
Example: Graph y' = 1. y, y{Q) = 2, over the interval [ 0, 1 ]
(SC
PLOT
Q T (T) @ Y (ENTER) T
(ENTER)0(ENTER)1(ENTER)
(0 2 (ENTER)
PLDT Va>=F(T,YJi
type: oiff Eq ¿:Deg
p: T+Y'
INDEP: T INIT: 0 FINAL: 1
SDLN: Y INIT: 2 iSTIFF
USE STIFF EUFF EQ SPLYEfiY
________
Step 2: Set the horizontal view to range from -1 to 2, set the
vertical view to range from -2 to 8, and mark the axes every
user-unit.
0F'TS (0 (0 1 (^ (ENTER)
2 (ENTER ) (0 2 (^/2) (ENTER) 8
(ENTER) 1 (ENTER) 1 (ENTER)
PLDT DPTIDN
TDL: . 0001 STEP: I>f It. ¿AKES
H-VAfi: 0 H-VIEW:-1 2
V-VAR: 1 V-VIEH: -£ 8
H-TICK: 1 V-TICK: 1 gPIKELS
TICK SPACINS UNITS ARE PIKELSi
BBHa W8BB mrta Baai m ;ni bitsu
19
Step 3: Draw the graph.
HiTiBiBara 1—nyaiiiiiwiMi
You can see that y{l) is approximate!)? 6. This coincides with the
result from the first example in this chapter.
Plotting a Stiff Differential Equation
Use the stiff plot method when equations take a very long time to plot
or when equations are plotted erratically. Plotting Stiff differential
equations requires that you enter the partial derivatives of the
equation.
Differential Equations 19-9
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