HP 48gII Graphing Calculator Manual do Utilizador descarregar pdf (Página 404)

100

101

Page 12-23

centered at the origin (0,0), will extend from -2 to 2 in x, and from -√3 to √3

in y.

Notice that for the circle and the ellipse the region corresponding to the left

and right extremes of the curves are not plotted. This is the case with all

circles or ellipses plotted using Conic as the TYPE.

• To see labels: @EDIT L@)LABEL @MENU

• To recover the menu: LL@)PICT

• To estimate the coordinates of the point of intersection, press the @(X,Y)@

menu key and move the cursor as close as possible to those points using

the arrow keys. The coordinates of the cursor are shown in the display.

For example, the left point of intersection is close to (-0.692, 1.67), while

the right intersection is near (1.89,0.5).

• To recover the menu and return to the PLOT environment, press L@CANCL.

• To return to normal calculator display, press L@@@OK@@@.

Parametric plots

Parametric plots in the plane are those plots whose coordinates are generated

through the system of equations x = x(t) and y = y(t), where t is known as the

parameter. An example of such graph is the trajectory of a projectile, x(t) =

+ v

⋅COS θ

⋅t, y(t) = y

+ v

⋅sin θ

⋅t – ½⋅g⋅t

. To plot equations like these,

which involve constant values x

, y

, v

, and θ

, we need to store the values of

those parameters in variables. To develop this example, create a sub-

directory called ‘PROJM’ for PROJectile Motion, and within that sub-directory

store the following variables: X0 = 0, Y0 = 10, V0 = 10 , θ0 = 30, and g =

9.806. Make sure that the calculator’s angle measure is set to DEG. Next,

define the functions (use „à):

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