HP 10413 Datasheet download pdf (Page 36)

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 -

, the graph would look as shown

right.

In the PLOT view shown, the first positive root

has been found (see page 63) as x=1.0471…

On the hp 39g+, if we now change to the HOME

view 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 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 ‘faulty’!

The only drawback of this method is that you

might change aplets and forget that it may also

change 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 39g+ you can see that if we turn Labels on and then PLOT, the

numeric mode also affects the axis labels.

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HP 10413 Datasheet Page 36