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6.6.2 FORMULA3 *(s, v)*

Defines a function of x, y and z.

*s* is a string which contains the expression for calculating the
values of the function at given (x, y, z) locations.
It must have a ";" at the end,
and can contain the predefined tokens "x", "y" and "z", the operators
+, -, *, / and ^ , the functions of the C math library
*sin, cos, tan, sinh, cosh, tanh, asin, acos, atan, atan2, exp, log, log10,
pow, sqrt, ceil, floor and fmod*,
and the names of variables.
*v* is a list of name and variable pairs (like for example ("pi", PI)),
which define under which names variables can be referenced in the formula.

*s* must be a string node, and *v* a typeless node to which the
above mentioned (name, variable) pairs are connected.

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2002-01-20