IBM Release 1.93 manual Freq, Lambda, Function, Hosts

FREQ	Syntax: FREQ <frequency in Hz>
LAMBDA	Syntax: LAMBDA <wavelength in metres>
	Specify the frequency or free-space wavelength of the excitation
	sources (all will be the same). FREQ is an alternative to
	LAMBDA—use one or the other, but not both.
	Examples:
	FREQ 200*THz
	FREQ c/(1.464*700*nm)	/* 700 nm in fused SiO2 */
	LAMBDA 1.55*micron	/* Communication wavelength */
	LAMBDA 6.328e-7	/* He-Ne laser */
FUNCTION	Define a user math function. User functions can be anything REXX
	can evaluate, plus elementary functions (sin, cos, tan, asin, acos,
	atan, atan2, exp, ln), Bessel functions of the first kind of integer
	order (Jn(x)), complete elliptic integrals, and a few other odds and
	ends. Once defined, a user function can be used freely in
	expressions anywhere a literal number or a variable could.
	Functions may be defined in terms of variables, literals, or other
	functions, subject to the file parsing rules. When optimization is
	enabled, functions whose output values depend on variables being
	optimized over will have their definitions updated on each iteration
	to reflect the new values of these variables.
	If the name of a formal parameter of the function is the same as
	that of a user variable, the formal parameter will override the user
	variable inside the function. Otherwise, any variables used by the
	function will be taken from the global scope. This allows functions
	to be parameterized by other variables, e.g. scale factors or offsets,
	which are not in the formal parameter list.
	Syntax:
	FUNCTION name(arg1, arg2,..., argN) = <expression>
	Examples:
	FUNCTION myfunc(a,x,q)=exp(a)*atan(q/x)*sqrt(23+q)
	FUNCTION parab(x,y,focus)=(x*x+y*y)/(4*focus)
	FUNCTION cone(x,y)=sqrt(parab(x,y,1)
HOSTS	Specifies a file containing TCP/IP information on the hosts available

to run the current simulation. Syntax: HOSTS <hostfile>

where entries in the given file are of the form

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