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XMM-Newton Science Analysis System


selectlib (selectlib-4.68) [xmmsas_20060628_1801-7.0.0]

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Arithmetic operators and functions

Boolean and arithmetic expression can contain arithmetic sub-expressions consisting of operators, functions and constants. The following operators and functions are available:

description	symbol/name
arithmetic negation	-
addition/subtraction	+/-
multiplication/division	*//
modulus	%
exponentiation	**, pow(x, y)
absolute value	abs(x)
sine/cosine/tangent	sin(x)/cos(x)/tan(x)
arc sine/arc cosine	arcsin(x)/arccos(x)
arc tan	arctan(x)/arctan2(x, y) = arctan(x/y)
hyperbolic sine/cosine/tangent	sinh(x)/cosh(x)/tanh(x)
exponential	exp(x)
natural log	log(x)
common log	log10(x)
square root	sqrt(x)
integral part	int(x)
fractional part	modf(x)
smallest integral value not less than $x$	ceil(x)
largest integral value not greater than $x$	floor(x)
floating point remainder of $x/y$	fmod(x, y)

The argument of the trigonometric functions and the result of their respective inverses are angles in units of radians. For required conversions between radians and decimal degrees please avail the symbolic constants #RAD and #DEG. Example: sin(ANGLE*#RAD), #DEG*arcsin(VAL).