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<H4>Arithmetic Expressions</H4>
Arithmetic expressions are made up of arithmetic elements and
arithmetic operators. The evaluation of an arithmetic expression
yields a single numeric value. Arithmetic elements consist of:
numeric constants, numeric variables, layer variables, numeric
attribute variables, numeric array variables and special variables.
Available operators are listed in the following sections.<p>
Examples of arithmetic expressions are:
<P>
<PRE>
        10.3
        sin(%3) * 27.05 - (2+ln(#temp))
        min(%1,%2,%3) * and(%6,15)
</PRE>
<H5>Operators</H5>
The following arithmetic operators are available with standard
algebraic precedence being observed:
<P>
<PRE>
        '-x'            negation
        '^'             exponentiation
        '/'             division
        '*'             multiplication
        '+'             addition
        '-'             subtraction
        '()'            parenthesis
</PRE>
<H5>Single Value Functions</H5>
The following single value arithmetic functions are available:
<P>
<PRE>
        sin   (e)               sine
        cos   (e)               cosine
        tan   (e)               tangent
        asin  (e)               arc sine
        acos  (e)               arc cosine
        atan  (e)               arc tangent
        deg   (e)               radians to degrees
        rad   (e)               degrees to radians
        ln    (e)               natural logarithm
        exp   (e)               natural exponent
        log10 (e)               base 10 logarithm
        exp10 (e)               base 10 exponent
        int   (e)               integer  part of real
        frac  (e)               fraction part of real
        abs   (e)               absolute value
</PRE>
where:
<P>
<PRE>
          e  can be any arithmetic expression.
          Arguments for trigonometric functions MUST be expressed 
          in radians.
</PRE>
example:
<P>
<PRE>
          int(tan(2.3 * ln(%6)))
</PRE>
<H5>Multi Value Functions</H5>
The following multi value arithmetic functions are available:
<P>
<PRE>
    atan2 (v1,v2)           arc tan (v1/v2) using signs of v1,v2
    mod   (v1,v2)           remainder of v1/v2
    min   (v1,v2,...,vn)    minimum value of v1,v2,...,vn
    max   (v1,v2,...,vn)    maximum value of v1,v2,...,vn
</PRE>
where
<P>
<PRE>
    v1,v2,...,vn            are arithmetic elements, excluding
                            attribute variables.
</PRE>
example:
<P>
<PRE>
    min (%1, %2, #temp, 25.5, @dbx)
</PRE>
<H5>Bit Manipulation Functions</H5>
The following bit manipulation functions are available. They are
accomplished by converting passed values to integers, performing the
logical operation on all the bits, and converting back. 'not'
operations should be followed by an 'and' to remove high bits.
<P>
<PRE>
    not (v1)                logical not
    and (v1,v2,...,vn)      logical and
    or  (v1,v2,...,vn)      logical inclusive or
    xor (v1,v2,...,vn)      logical exclusive or
</PRE>
where
<P>
<PRE>
    v1,v2,...,vn            are arithmetic elements, excluding
                            attribute variables.
</PRE>
example:
<P>
<PRE>
    #t = not(%1); #t= and(#t,255);   | to ensure only 8 bits
</PRE>
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