HP 40gs HP 39gs_40gs_Mastering The Graphing Calculator_English_E_F2224-90010.p - Page 163
The PLOT mode, The SYMB mode, The operation of the two modes is summarized below.
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The operation of the two modes is summarized below. The PLOT mode The underlying concept in PLOT mode is that the graph controls the equation. The user has control of the graph via two manipulation points (see above and below) and any changes to the graph are reflected in the equation at the top of the screen. Looking at the screens on the right it will be seen that the third screen key toggles the point of control for the graph. It is only visible in PLOT mode. When in PLOT mode the graph is changed using the arrow keys. The effects of the arrow keys vary according to the location of the control point. • when control is set to the graph translates left and right (the c coefficient) or up & down (the d coefficient). • when control is set to the graph dilates parallel to the y axis (the a coefficient) or parallel to the x axis (the b coefficient). Unlike the SYMB mode where the b coefficient goes up or down in steps of 0.1, the increments in PLOT mode are not regular but are chosen to be 'nice' fractions of π. The slight difference in results is most easily seen by simply experimenting. The SYMB mode The underlying concept in SYMB mode is that the equation controls the graph. The user has control of the coefficients and any changes are reflected in the graph. All four coefficients are shown at the top of the screen even when one or more is redundant. 163
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