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Using Variables
A variable is a defined value that can be used multiple times in a problem. You
can define a value or function as a variable within each application. Within a
problem, variables are shared by TI-Nspire™applications. For example, you
can create a variable in Calculator, and then use or modify it in Graphs &
Geometry or Lists & Spreadsheet within the same problem.
Each variable has a name and a definition and the definition can be changed.
When you change the definition, all occurrences of the variable in the problem
are updated to use the new definition. In the TI-Nspire™ software, a variable
has four attributes:
• Name - User-defined name assigned when the variable is created.
• Location - Variables are stored in memory.
• Value - Number, text, mathematical expression, or function.
• Type - Type of data that can be stored as a variable.
Note: Variables created with the Local command within a user-defined function
or program are not accessible outside that function or program.
Linking Values on Pages
Values and functions created or defined in one application can interact with
other applications (within the same problem) to share data.
When using linked items, keep in mind:
• Values can be linked between applications on one page or between
different pages of the same problem.
• All applications are linked to the same data.
• If the linked value is changed in the original application, the change is
reflected in all linked usages.
Defining a variable is the first step in linking values.
Creating Variables
Any portion or attribute of an object or function created within an application
can be stored as a variable. Examples of attributes that can become variables
are the area of a rectangle, the radius of a circle, the value contained in a
Using Variables 163