Calculator User Manual

Chapter 17: Programming 289
17PROGRM.DOC TI-89/TI-92 Plus: Programming (English) Susan Gullord Revised: 02/23/01 1:14 PM Printed: 02/23/01 2:18 PM Page 289 of 40
When evaluating a user-defined function or running a program, you
can specify an argument that includes the same variable that was
used to define the function or create the program. However, to avoid
Circular definition
errors, you must assign a value for
x
or
i
variables
that are used in evaluating the function or running the program.
For example:
x+1
!
x
– or –
For i,i,10,1
Disp i
EndFor
Command Description
§
key Stores a value to a variable. As on the Home screen,
pressing
§
enters a
!
symbol.
Archive
Moves specified variables from RAM to user data
archive memory.
BldData
Lets you create a data variable based on the graph
information entered in the Y=Editor, Window
Editor, etc.
CopyVar
Copies the contents of a variable.
Define
Defines a program (subroutine) or function variable
within a program.
DelFold
Deletes a folder. All variables in that folder must be
deleted first.
DelVar
Deletes a variable.
getFold
Returns the name of the current folder.
getType
Returns a string that indicates the data type (
EXPR
,
LIST
, etc.) of a variable.
Local
Declares one or more variables as local variables.
Lock
Locks a variable so that it cannot be accidentally
changed or deleted without first being unlocked.
MoveVar
Moves a variable from one folder to another.
NewData
Creates a data variable whose columns consist of a
series of specified lists.
NewFold
Creates a new folder.
NewPic
Creates a picture variable based on a matrix.
Rename
Renames a variable.
Unarchiv
Moves specified variables from user data archive
memory to RAM.
Unlock
Unlocks a locked variable.
Circular Definition
Errors
Variable-Related
Commands
Note: The
Define
,
DelVar
,
and
Local
commands are
available from the Program
Editor’s
†
Var
toolbar
menu.
Causes a
Circular definition
error message if x
or i does not have a value. The error does not
occur if x or i has already been assigned a value.