From: Colin Bartlett <colinb2r@...>
Date: 2010-05-14T00:43:24+09:00
Subject: Re: In Ruby, can the coerce() method know what operator it is th

On Thu, May 13, 2010 at 3:25 PM, Benoit Daloze <eregontp@gmail.com> wrote:
>
> :O Google seems to not know me so much then ...
>
> But, as many Ruby developers, github is the code's home ;)
> (while you would hardly find my nickname, except maybe from my email)
> http://github.com/eregon/math/tree/master/math
I wish I'd known about this
  http://github.com/eregon/math/blob/master/math/polynomial.rb
earlier this year: including differentiation _and_ integration!
I was using polynomials to form weighted sums of discrete and
continuous actuarial functions, so I needed integration of the
polynomials.
I couldn't find a polynomial.evaluate method, but polynomial.run(n)
seems to give the numerical value of the polynomial for x == n: is
that right?

### def -@(); @coef.map! { |c| -c }; end
q = Polynomial.new( 2, 3, 1 )
p q #=>   2x^2 + 3x + 1
-q
p q #=> - 2x^2 - 3x - 1

If you don't mind me asking, what was the reason for #- changing the
polynomial to its negative as opposed to returning a new polynomial
which is the negative of the original polynomial?