HP 48gII hp 48gII_user's manual_English_E_HDPMSG48E67_V2.pdf - Page 745

otherwise quiescent water that gets reflected from the walls of a circular tank back towards the center. Press $ to stop the animation. Example 2 - Animating the plotting of different power functions Suppose that you want to animate the plotting of the functions f(x) = xn, n = 0, 1, 2, 3, 4, in the same set of axes. You could use the following program: « Begin program RAD Set angle units to radians 131 R B 64 R B PDIM Set PICT screen to 131×64 pixels 0 2 XRNG 0 20 YRNG Set x- and y-ranges 0 4 FOR j Start loop with j = 0,1,...,4 'X^j' STEQ Store 'X^j' in variable EQ ERASE Erase current PICT DRAX LABEL DRAW Draw axes, labels, function PICT RCL Place current PICT on stack NEXT End FOR-NEXT loop 5 ANIMATE Animate » Store this program in a variable called PWAN (PoWer function ANimation). To run the program press J (if needed) @PWAN. You will see the calculator drawing each individual power function before starting the animation in which the five functions will be plotted quickly one after the other. To stop the animation, press $. More information on the ANIMATE function The ANIMATE function as used in the two previous examples utilized as input the graphics to be animated and their number. You can use additional information to produce the animation, such as the time interval between graphics and the number of repetitions of the graphics. The general format of the ANIMATE function in such cases is the following: n-graphs { n {#X #Y} delay rep } ANIMATE n represents the number of graphics, {#X #Y} stand for the pixel coordinates of the lower right corner of the area to be plotted (see figure below), delay is the number of seconds allowed between consecutive graphics in the animation, and rep is the number of repetitions of the animation. Page 22-29