NAME

       ev - evaluate expressions

SYNOPSIS

       ev 'expr' ..

DESCRIPTION

       Ev  evaluates expressions given on the command line, and sends the results to the standard
       output, one per line.  An expression  contains  real  numbers,  function  calls,  and  the
       following operators:

            +  -  *  /  ^

       Operators  are  evaluated  left  to right, except '^', which is right associative.  Powers
       have the highest precedence; multiplication and division are evaluated before addition and
       subtraction.   Expressions  can  be  grouped  with  parentheses.   All  values  are double
       precision real.

       The following library of functions is available:

       if(cond, then, else)
                 if cond is greater than zero, then is evaluated, otherwise else is evaluated.

       select(N, a1, a2, ..)
                 return aN (N is rounded to the nearest integer).  If N is zero,  the  number  of
                 available arguments is returned.

       rand(x)   compute a random number between 0 and 1 based on x.

       floor(x)  return largest integer not greater than x.

       ceil(x)   return smallest integer not less than x.

       sqrt(x)   return square root of x.

       exp(x)    compute e to the power of x (e approx = 2.718281828).

       log(x)    compute the logarithm of x to the base e.

       log10(x)  compute the logarithm of x to the base 10.

       sin(x), cos(x), tan(x)
                 trigonometric functions.

       asin(x), acos(x), atan(x)
                 inverse trigonometric functions.

       atan2(y, x)
                 inverse tangent of y/x (range -pi to pi).

EXAMPLE

       To pass the square root of two and the sine of .5 to a program:

         program `ev 'sqrt(2)' 'sin(.5)'`

AUTHOR

       Greg Ward

SEE ALSO

       icalc(1), rcalc(1)