HP 48gII hp 48gII_user's manual_English_E_HDPMSG48E67_V2.pdf - Page 411

You can have more than one condition plotted at the same time if you multiply the conditions. For example, to plot the graph of the points for which X2/36 + Y2/9 < 1, and X2/16 + Y2/9 > 1, use the following: • Press „ô, simultaneously if in RPN mode, to access to the PLOT SETUP window. • 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. • Press @ERASE @DRAW to draw the truth plot. Again, you have to be patient while the calculator produces the graph. If you want to interrupt the plot, press $ , once. Then press @CANCEL . Plotting histograms, bar plots, and scatter plots Histograms, bar plots and scatter plots are used to plot discrete data stored in the reserved variable ΣDAT. This variable is used not only for these types of plots, but also for all kind of statistical applications as will be shown in Chapter 18. As a matter of fact, the use of histogram plots is postponed until we get to that chapter, for the plotting of a histogram requires to perform a grouping of data and a frequency analysis before the actual plot. In this section we will show how to load data in the variable ΣDAT and how to plot bar plots and scatter plots. We will use the following data for plotting bar plots and scatter plots: x yz 3.1 2.1 1.1 3.6 3.2 2.2 4.2 4.5 3.3 4.5 5.6 4.4 4.9 3.8 5.5 5.2 2.2 6.6 Bar plots First, make sure your calculator's CAS is in Exact mode. data shown above as a matrix, i.e., Next, enter the Page 12-30