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+.help mathfcns Feb86 language
+.ih
+NAME
+mathfcns -- math functions available in the CL
+.ih
+SYNOPSIS
+
+.nf
+Function    Return value		  Description
+
+sin(x)		real			sine
+cos(x)		real			cosine
+tan(x)		real			tangent
+atan2(x,y)	real			arc-tangent
+exp(x)		real			e**x
+log(x)		real			natural logarithm
+log10(x)	real			common logarithm
+frac(x)		real			fractional part
+abs(x)		type of argument	absolute value
+min(a,b,...)	type of min. arg	minimum of a list of values
+max(a,b,...)	type of max. arg	maximum of a list of values
+real(x)		real			convert to real
+int(x)		integer			integer part
+.fi
+.ih
+DESCRIPTION
+A number of mathematical functions are available under the CL.  In general
+they return real values and may be used wherever a real expression is
+valid.  The input arguments may be integer or real and may be mixed in
+cases where the function has more than one argument.
+Exceptions:
+
+.nf
+    abs(x) 	returns real or integer depending on its argument
+    int(x)	returns an integer
+    min,max	return a copy of the min/max operand, no type change
+.fi
+
+Note that the intrinsic functions \fIint\fR and \fIreal\fR may be called
+to decode string valued arguments.
+.ih
+EXAMPLES
+.nf
+y = sin (x)
+  = 180 / 3.1415927 * atan2 (x, y)
+i = int (max (4.3, x, y, 2))
+  = 1. - (sin(.5)**2 + cos(.5)**2)
+.fi
+.ih
+BUGS
+An invalid argument list to a math function (e.g. log(-1)) will terminate
+a script.
+.ih
+SEE ALSO
+strings
+.endhelp