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It is critical to your efficient use of the hp 39g+ that you understand how the
angle and numeric settings work. For those upgrading from the hp 38g this is
particularly important, since the behavior is significantly different.
On the hp 39g+, when you set the angle measure or the numeric format in
the MODES view, it applies both to the aplet and to the HOME view. However,
this setting applies only to the currently active aplet (the one highlighted in
the APLET view). This means that if you change active aplet then these
settings may change also, not only for the aplet but in the
HOME
view too.
For example, suppose you have been
performing trig calculations in the HOME view
with the Function aplet being currently active,
and have set the angle measure to DEG.
If you were to now change to the Solve aplet in
order to solve an equation then the settings
would revert to those of the Solve aplet;
probably be radians unless you had also
changed those as well.
Radian measure is the default for all aplets
and thus also for HOME unless you change it.
Performing the same calculation in HOME
would now give a different result (see right).
Although this may seem to be a strange way of doing things, there is actually
a very good reason for it. The hp 38g did not behave this way and it caused
a number of users to have difficulties as you'll see on the next page.
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