ev - evaluate expressions |

ev 'expr' .. |

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). |

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

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

Greg Ward |

calc(1), rcalc(1) |

http://www.schorsch.com/en/software/rayfront/manual/htmlman/ev.html

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Copyright © 2004-2013 schorsch.com