Appendix B: Reference Information 569
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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 are operators that come directly after an argument,
such as 5!, 25%, or 60ó15' 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 (^) 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.
To enter a negative number, press · followed by the number. Post
operations and exponentiation are performed before negation. For
example, the result of ëx2 is a negative number, and ë92 =ë81. Use
parentheses to square a negative number such as (ë9)2 to produce
81. Note also that negative 5 (ë5) is different from minus 5 (ì5), and
ë3! evaluates as ë(3!).
The argument following the “with” (|) operator provides a set of
constraints that affect the evaluation of the argument preceding the
“with” operator.
Indirection
Post Operators
Exponentiation
Negation
Constraint (|)