Simple alias for a Matlab-like imshow function.

def imagesc(data, title=None, fig='current', ax=None):
  '''Simple alias for a Matlab-like imshow function.'''
  ax = _get_axis(fig, ax, False)
  ax.imshow(data, interpolation='nearest', aspect='auto')
  if title:
    ax.set_title(title)
  return plt.show