olivierverdier/pychebfun — pull request #10 by ghpotter (2012-06-21 18:47:06+00:00)
Title: Fixed the differentiate

I found the error in chebfun.py.

Line 346 should be
bi = np.append(bi[1]/2. + self.ai[1], bi)

instead of
bi = np.append(bi[1]/2. + self.ai[0], bi)

I ran the latest test update and it passed.