Storing And Recalling Variable Values - Texas Instruments TI-89 Manual Book

Storing and Recalling Variable Values

Rules for Variable
Names
Examples
Data Types
When you store a value, you store it as a named variable. You
can then use the name instead of the value in expressions.
When the
TI-89 / TI-92 Plus
expression, it substitutes the variable's stored value.
A variable name:
¦
Can use 1 to 8 characters consisting of letters and digits. This
includes Greek letters (but not p), accented letters, and
international letters. Do not include spaces.
The first character cannot be a digit.
¦
Can use uppercase or lowercase letters. The names
, and all refer to the same variable.
aB22 ab22
¦
Cannot be the same as a name that is preassigned by the
. Preassigned names include:
TI-89 / TI-92 Plus
Built-in functions (such as
LineVert ). Refer to Appendix A.
System variables (such as
store graph-related values). Refer to Appendix B for a list.
Variable Description
OK
myvar
OK
a
Not OK, name is preassigned to the
Log
OK
Log1
3rdTotal Not OK, starts with a digit.
Not OK, more than 8 characters.
circumfer
You can save any
TI-89 / TI-92 Plus
data types, refer to getType()
Data Types
Expressions
Lists
Matrices
Character strings
Pictures
Functions
encounters the name in an
) and instructions (such as
abs
and
xmin xmax
data type as a variable. For a list of
in Appendix A. Some examples are:
Examples
2.54, 1.25í 6, 2p, xmin/10, 2+3i, (xì 2)ñ, 2/2
{2 4 6 8}, {1 1 2}
1 0 0
,
[1 0 0]
3 4 6
"Hello", "The answer is:", "xmin/10"
myfunc(arg), ellipse(x,y,r1,r2)
Chapter 2: Operating the Calculator
, ,
AB22 Ab22
, which are used to
function.
log
47