HP 48gII hp 48gII_user's manual_English_E_HDPMSG48E67_V2.pdf - Page 723

CENTR (g) The command CENTR takes as argument an ordered pair (x,y) or a value x, and adjusts the first two elements in the variable PPAR, i.e., (xmin, ymin) and (xmax, ymax), so that the center of the plot is (x,y) or (x,0), respectively. SCALE (h) The SCALE command determines the plotting scale represented by the number of user units per tick mark. The default scale is 1 user-unit per tick mark. When the command SCALE is used, it takes as arguments two numbers, xscale and yscale, representing the new horizontal and vertical scales. The effect of the SCALE command is to adjust the parameters (xmin, ymin) and (xmax, ymax) in PPAR to accommodate the desired scale. The center of the plot is preserved. SCALEW (i) Given a factor xfactor, the command SCALEW multiplies the horizontal scale by that factor. The W in SCALEW stands for 'width.' The execution of SCALEW changes the values of xmin and xmax in PPAR. SCALEH (j) Given a factor yfactor, the command SCALEH multiplies the vertical scale by that factor. The H in SCALEH stands for 'height.' The execution of SCALEW changes the values of ymin and ymax in PPAR. Note: Changes introduced by using SCALE, SCALEW, or SCALEH, can be used to zoom in or zoom out in a plot. ATICK (l) The command ATICK (Axes TICK mark) is used to set the tick-mark annotations for the axes. The input value for the ATICK command can be one of the following: • A real value x : sets both the x- and y-axis tick annotations to x units • A list of two real values { x y }: sets the tick annotations in the x- and y- axes to x and y units, respectively. • A binary integer #n: sets both the x- and y-axis tick annotations to #n pixels Page 22-7