HP 48gII hp 48gII_user's manual_English_E_HDPMSG48E67_V2.pdf - Page 406

• Press @ERASE @DRAW to draw the parametric plot. • Press @EDIT L @LABEL @MENU to see the graph with labels. The window parameters are such that you only see half of the labels in the x-axis. • Press L to recover the menu. Press L@)PICT to recover the original graphics menu. • Press TRACE @(X,Y)@ to determine coordinates of any point on the graph. Use ™ and š to move the cursor about the curve. At the bottom of the screen you will see the value of the parameter t and coordinates of the cursor as (X,Y). • Press L@CANCL to return to the PLOT WINDOW environment. Then, press $ , or L@@@OK@@@, to return to normal calculator display. A review of your soft menu key labels shows that you now have the following variables: t, EQ, PPAR, Y, X, g, θ0, V0, Y0, X0. Variables t, EQ, and PPAR are generated by the calculator to store the current values of the parameter, t, of the equation to be plotted EQ (which contains 'X(t) + I∗Y(t)'), and the plot parameters. The other variables contain the values of constants used in the definitions of X(t) and Y(t). You can store different values in the variables and produce new parametric plots of the projectile equations used in this example. If you want to erase the current picture contents before producing a new plot, you need to access either the PLOT, PLOT WINDOW, or PLOT SETUP screens, by pressing or „ô (the two keys must be pressed simultaneously Page 12-25