HP 48gII hp 48gII_user's manual_English_E_HDPMSG48E67_V2.pdf - Page 390
Check that when Y:1.00E0, X:2.72E0.
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equation writer with the expression Y1(X)= . Type LN(X). Press ` to return to the PLOT-FUNCTION window. Press L@@@OK@@@ to return to normal calculator display. The next step is to press, simultaneously if in RPN mode, the left-shift key „ and the ò(B) key to produce the PLOT WINDOW - FUNCTION window. Most likely, the display will show the horizontal (H-View) and vertical (V-View) ranges as: H-View: -6.5 6.5, V-View: -3.1 3.2 These are the default values for the x- and y-range, respectively, of the current graphics display window. Next, change the H-View values to read: H-View: -1 10 by using 1\@@@OK@@ 10@@@OK@@@. Next, press the soft key labeled @AUTO to let the calculator determine the corresponding vertical range. After a couple of seconds this range will be shown in the PLOT WINDOWFUNCTION window. At this point we are ready to produce the graph of ln(X). Press @ERASE @DRAW to plot the natural logarithm function. To add labels to the graph press @EDIT L@)LABEL. Press @MENU to remove the menu labels, and get a full view of the graph. Press L to recover the current graphic menu. Press L@)PICT to recover the original graphical menu. To determine the coordinates of points on the curve press @TRACE (the cursor moves on top of the curve at a point located near the center of the horizontal range). Next, press (X,Y) to see the coordinates of the current cursor location. These coordinates will be shown at the bottom of the screen. Use the right- and left-arrow keys to move the cursor along the curve. As you move the cursor along the curve the coordinates of the curve are displayed at the bottom of the screen. Check that when Y:1.00E0, X:2.72E0. This is the point (e,1), since ln(e) = 1. Press L to recover the graphics menu. Next, we will find the intersection of the curve with the x-axis by pressing @)FCN @ROOT. The calculator returns the value Root: 1, confirming that ln(1) = 0. Press LL@)PICT @CANCL to return to the PLOT WINDOW - FUNCTION. Press ` to return to normal calculator display. You will notice that the root found in the graphics environment was copied to the calculator stack. Page 12-9
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