HP 48gII hp 48gII_user's manual_English_E_HDPMSG48E67_V2.pdf - Page 407

if in RPN mode). Then, press @ERASE @DRAW. Press @CANCL to return to the PLOT, PLOT WINDOW, or PLOT SETUP screen. Press $, or L@@@OK@@@, to return to normal calculator display. Generating a table for parametric equations In an earlier example we generated a table of values (X,Y) for an expression of the form Y=f(X), i.e., a Function type of graph. In this section, we present the procedure for generating a table corresponding to a parametric plot. For this purpose, we'll take advantage of the parametric equations defined in the example above. • First, let's access the TABLE SETUP window by pressing „õ, simultaneously if in RPN mode. For the independent variable change the Starting value to 0.0, and the Step value to 0.1. Press @@@OK@@@. • Generate the table by pressing, simultaneously if in RPN mode, „ö. The resulting table has three columns representing the parameter t, and the coordinates of the corresponding points. For this table the coordinates are labeled X1 and Y1. • Use the arrow keys, š™-˜, to move about the table. • Press $ to return to normal calculator display. This procedure for creating a table corresponding to the current type of plot can be applied to other plot types. Plotting the solution to simple differential equations The plot of a simple differential equation can be obtained by selecting Diff Eq in the TYPE field of the PLOT SETUP environment as follows: suppose that we want to plot x(t) from the differential equation dx/dt = exp(-t2), with initial conditions: x = 0 at t = 0. The calculator allows for the plotting of the solution Page 12-26