This is the command ev that can be run in the OnWorks free hosting provider using one of our multiple free online workstations such as Ubuntu Online, Fedora Online, Windows online emulator or MAC OS online emulator
PROGRAM:
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)'`
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