[Numpy-discussion] what goes wrong with cos(), sin()

[Anne Archibald]

On 21/02/07, Zachary Pincus <zpincus at stanford.edu> wrote:

> A corrolary: in general do not two floating-point values for equality
> -- use something like numpy.allclose. (Exception -- equality is
> expected if the exact sequence of operations to generate two numbers
> were identical.)

I really can't agree that blindly using allclose() is a good idea. For
example, allclose(plancks_constant,0) and the difference leads to
quantum mechanics... you really have to know how much difference you
expect and how big your numbers are going to be.

Anne