Expression

You may use any number of user-defined variables, provided that the variable names are not equal to any of the reserved function names (see below). A user-defined variable always starts with a letter and may consist of any number of digits and letters and the underscore character ('_'). See Evaluate for further details on variables.

The expression may use the following pre-defined constants, operators, and functions:

--- Constants ---
true	logical true (or -1, if used as number)
false	logical false (or 0, if used as number)
pi	the number Pi (3.14159...)
--- Arithmetic Operators ---
+	sum: x+y
-	difference: x-y
*	product: x*y
/	division: x/y
#	modulo: round(x) mod round(y)
^	power: exponentiation x^y , x>0, y..any real values
--- Logic Operators ---
>	greater than
>=	greater than or equal
=	equal
><	not equal
<	less than
<=	less than or equal
and	boolean or bitwise and
not	boolean or bitwise not
or	boolean or bitwise or
xor	boolean or bitwise exclusive or
--- Functions ---
abs	absolute value: abs(x), x..any real value
arccos	inverse cosine: arccos(x), x..angle in radians
arcsin	inverse sine: arcsin(x), x..angle in radians
arctan	inverse tangens: arctan(x), x..angle in radians
cos	cosine: cos(x), x..angle in radians
exp	exponential function: exp(x)
frac	fraction: frac(x) = x - int(x)
gauss	gauss creates normally distributed random numbers with zero mean and unit standard deviation
int	round towards zero: int(x)
lg	decadic logarithm: lg(x)
ln	natural logarithm: ln(x)
rand	uniformly distributed random numbers: random(x), x..amplitude of noise (mean = 0.0)
round	round to the nearest integer: round(x)
sign	sign of x: sign(x)
sin	sinus: sin(x)
sqr	square: sqr(x)
sqrt	square root: sqrt(x)
tan	tangens: tan(x)