HP 48gII hp 48gII_user's manual_English_E_HDPMSG48E67_V2.pdf - Page 410
Truth plots, RESET, ERASE, LABEL @MENU, CANCL
UPC - 829160013183
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Truth plots Truth plots are used to produce two-dimensional plots of regions that satisfy a certain mathematical condition that can be either true or false. For example, suppose that you want to plot the region for X^2/36 + Y^2/9 < 1, proceed as follows: • Press „ô, simultaneously if in RPN mode, to access to the PLOT SETUP window. • Change TYPE to Truth. • Press ˜ and type {'(X^2/36+Y^2/9 < 1)','(X^2/16+Y^2/9 > 1)'} @@@OK@@@ to define the conditions to be plotted. • The cursor is now in the Indep field. Leave that as 'X' if already set to that variable, or change it to 'X' if needed. • Press L@@@OK@@@ to return to normal calculator display. • Press „ò, simultaneously if in RPN mode, to access the PLOT window (in this case it will be called PLOT WINDOW - TRUTH window). Let's keep the default value for the window's ranges: H-View: -6.5 6.5, V-View: -3.1 3.2 (To reset them use L @RESET (select Reset all) @@OK@@ L). Note: if the window's ranges are not set to default values, the quickest way to reset them is by using L@RESET@ (select Reset all) @@@OK@@@ L. • Press @ERASE @DRAW to draw the truth plot. Because the calculator samples the entire plotting domain, point by point, it takes a few minutes to produce a truth plot. The present plot should produce a shaded ellipse of semi-axes 6 and 3 (in x and y, respectively), centered at the origin. • 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 (X,Y) to determine coordinates of any point on the graph. Use the arrow keys to move the cursor about the region plotted. At the bottom of the screen you will see the value of the 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. Page 12-29
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