136 TI-Nspire™ Reference Guide
Indirection
The indirection operator (#) converts a string to a variable or function name. For example,
#(“x”&”y”&”z”) creates the variable name xyz. Indirection also allows the creation and
modification of variables from inside a program. For example, if 10&r and “r”&s1, then #s1=10.
Post operators
Post operators are operators that come directly after an argument, such as 5!, 25%, or 60¡15'
45". Arguments followed by a post operator are evaluated at the fourth priority level. For
example, in the expression 4^3!, 3! is evaluated first. The result, 6, then becomes the exponent
of 4 to yield 4096.
Exponentiation
Exponentiation (^) and element-by-element exponentiation (.^) are evaluated from right to
left. For example, the expression 2^3^2 is evaluated the same as 2^(3^2) to produce 512. This
is different from (2^3)^2, which is 64.
Negation
To enter a negative number, press v followed by the number. Post operations and
exponentiation are performed before negation. For example, the result of Lx
2
is a negative
number, and L9
2
= L81. Use parentheses to square a negative number such as (L9)
2
to produce
81.
Constraint (|)
The argument following the “with” (|) operator provides a set of constraints that affect the
evaluation of the argument preceding the “with” operator.
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