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...)
--- References ---
°	currently referenced cell; this symbol indicates the value of the currently referenced cell when iterating through a range of cells. It is treated as a (predefined) variable. Thus the user has to supply the actual value in the OnVarRequest event.
--- 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)
max	returns the maximum of a list of variables: max(list), with list containing a list of variables reparated by commas;(1) a range of numbered variables may be abbreviated by the ':' sign (i.e. "xx8:11" expands to "xx8, xx9, xx10, xx11"). The list may contain constant values, as well.
mean	returns the mean of a list of variables: mean(list), with list containing a list of variables reparated by commas;(1) a range of numbered variables may be abbreviated by the ':' sign (i.e. "xx8:11" expands to "xx8, xx9, xx10, xx11"). The list may contain constant values, as well.
min	returns the minimum of a list of variables: min(list), with list containing a list of variables reparated by commas;(1) a range of numbered variables may be abbreviated by the ':' sign (i.e. "xx8:11" expands to "xx8, xx9, xx10, xx11"). The list may contain constant values, as well.
nddens	density of the standard normal distribution: nddens(x)
ndint	integral of the standard normal distribution from -infinity to x: ndint(x)
ndquant	quantile of the standard normal distribution for a probability x: ndquant(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)
sum	returns the sum of a list of variables: sum(list), with list containing a list of variables reparated by commas;(1) a range of numbered variables may be abbreviated by the ':' sign (i.e. "zz1:3" expands to "zz1, zz2, zz3"). The list may contain constant values, as well.
tan	tangens: tan(x)
var	returns the variance of a list of variables: var(list), with list containing a list of variables reparated by commas;(1) a range of numbered variables may be abbreviated by the ':' sign (i.e. "xx8:10,aux4,y1:3" expands to "xx8, xx9, xx10, aux4, y1, y2, y3"). The list may contain constant values, as well.

(1)	The maximum number of list elements may not exceed 2000. However the exact limit depends on the structure of the formula, so the maximum number is slightly lower (most often between 1980 and 1999).