xenial (1) ev.1.gz

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)