HP 40gs HP 39gs_40gs_Mastering The Graphing Calculator_English_E_F2224-90010.p - Page 29
is that you might change aplets and forget that it may also change the, view settings. For this reason
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Suppose we define a trig function in the Function aplet as shown. The default setting for the Function aplet is radians, so if we set the axes to extend from -π to π , the graph would look as shown right. In the PLOT view shown, the first positive root has been found (see page 57) as x=1.0471... On the hp 39gs and hp 40g, if we now change to the HOME view, retrieve the root and perform the calculation shown right, we expect that the answer should be zero, as indeed it is. However, this is only the case because the angle measures of HOME and the Function aplet agree. The problem was that on the original hp 38g the default setting for the Function aplet was radians, while HOME had a default setting of degrees and its setting was independent of those of the aplet. This meant that a calculation such as the one above would give incorrect results, and caused considerable confusion to some students. It even resulted in users returning their hp 38g to dealers as being 'faulty'! Hence the change, which was first made in the hp 39g and hp 40g. The only drawback of synchronizing the settings of the HOME and aplet is that you might change aplets and forget that it may also change the HOME view settings. For this reason, the name of the active aplet is shown at the top of the HOME view as a reminder. On the hp 39gs and hp 40gs you can see that if we turn Labels on and then PLOT, the numeric mode also affects the axis labels. The default behavior in the PLOT view is to not display axis labels due to the way that they often interfere with the clear display of the graph. 29