HP 40gs HP 39gs_40gs_Mastering The Graphing Calculator_English_E_F2224-90010.p - Page 87
Plot-Table, As mentioned, choice of scale in
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Plot-Table The next item on the VIEWS menu is Plot-Table. This option plots the graph on the right, with the Numeric view on the right half screen. Using the left/right arrow keys moves the cursor in both the graph and the numeric windows. See page 79 for information on how to keep nice scales in the table view. When more than one function defined in the SYMB view, pressing the up or down arrows changes the table focus from one to another. In this case, with only one, it centers the table. Let us switch now to a graph of the two functions F1( X ) = X 2 −1 and F 2( X ) = X 3 + 2X 2 − 5X − 4 . This is shown on the right, using an XRng of -8 to 8. Choosing Plot-Table gives the result shown left. As you can see, the scale has been preserved unchanged, although without labels. The table on the right also uses a sensible scale of 0.25 because of the choice of an x axis scale of -8 to 8. As mentioned, choice of scale in the PlotTable view is discussed in detail on page 79. The technique is requires slightly different values than the default values in the PLOT SETUP view. Looking at the table heading you will see that it currently shows the function F1(X). The left/right arrow keys move within that function, with the cursor keeping track. Pressing the up/down arrows now not only centers the table highlight but, more importantly switches from F1(X) to F2(X). The X column does not change. 87
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