HP 39gs_40gs_Mastering The Graphing Calculator_English_E_F2224-90010

It is critical to your efficient use of the hp 39gs and hp 40gs that you understand how the angle and numeric

settings work. For those few who may be upgrading from the original hp 38g released in the mid ‘90s this is

particularly important, since the behavior is significantly different.

On the hp 39gs and hp 40gs, 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 exactly the same calculation in

HOME

would now give a different result, as shown right.

Although this may seem to be a strange way of doing things, there is actually a very good reason for it. On

the original first model, the hp 38g, the settings for the

HOME view were independent from those of the aplets

and it caused a number of users to have difficulties as you'll see on the next page.