Hp Prime Graphing Calculator Manuel d'utilisateur télécharger pdf (Page 429)

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Variables 423

Variables

Variables are objects that have names and contain data.

They are used to store data, either for later use or to

control settings in the Prime system. There are four types of

variables, all of which can be found in the

Vars menu by

pressing

• Home variables

• CAS variables

• App variables

• User variables

The Home and app

variables all have names

reserved for them. They

are also typed; that is, they can contain only certain types

of objects. For example, the Home variable A can only

contain a real number. You use Home variables to store

data that is important to you, such as matrices, lists, real

numbers, etc. You use app variables to store data in apps

or to change app settings. You can accomplish these

same tasks via the user interface of an app, but app

variables give you a quick way of doing these tasks, either

from Home or within a program. For example, you can

store the expression “SIN(X)” in the Function app

variable F1 in Home View, or you could open the Function

app, navigate to F1(X), and enter SIN(X) in that field.

CAS and user variables can be created by the user and

they have no particular type. Their names may be of any

length as well. Thus, diff(t2,t) returns 2*t and

diff((bt)2, bt) returns 2*bt for the CAS variables

t and bt. Further evaluation of 2*bt will only return

2*bt, unless an object has been stored in bt. For

example, if you enter bt:={1,2,3} and then enter

diff((bt)2, bt), the CAS will still return 2*bt. But if

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Hp Prime Graphing Calculator Manuel d'utilisateur Page 429

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