misc.rst

Miscellaneous

.. hoc:data:: float_epsilon


    Syntax:
        ``float_epsilon = 1e-11``


    Description:
        The default value is 1e-11

        Allows somewhat safer logical comparisons and integer truncation for
        floating point numbers. Most comparisons are treated as true if they are
        within float_epsilon of being true. eg.


        .. code-block::
            none

            for (i = 0; i < 1; i += .1) {
                print i, int(10*i)
            }
            float_epsilon = 0
            // two bugs due to roundoff
            for (i = 0; i < 1; i += .1) {
                print i, int(10*i)
            }


    .. warning::
        I certainly haven't gotten every floating comparison in the program to use
        ``float_epsilon`` but I have most of them including all interpreter logical
        operations, int, array indices, and Vector logic methods.