On Fri, May 22, 2009 at 3:59 PM, David Warde-Farley <d...@cs.toronto.edu> wrote: > On 22-May-09, at 1:03 PM, Christopher Barker wrote: > >> In [104]: zip(indices[np.r_[True, breaks[:-1]]], indices[breaks]) > > > > I don't think this is very general: > > In [53]: indices > Out[53]: > array([ -3, 1, 2, 3, 4, 5, 6, 7, 8, > 9, 255, 256, 257, 258, 10001, 10002, 10003, 10004]) > > In [54]: breaks = diff(indices) != 1 > > In [55]: zip(indices[np.r_[True, breaks[:-1]]], indices[breaks]) > Out[55]: [(-3, -3), (1, 9), (255, 258)] >
this still works: >>> indices = >>> np.array([-5,-4,-3,1,1,2,3,4,5,6,7,8,9,255,256,257,258,10001,10002,10003,10004]) >>> idx = (np.diff(indices) != 1).nonzero()[0] >>> idxf = np.hstack((-1,idx,len(indices)-1)) >>> vmin = indices[idxf[:-1]+1] >>> vmax = indices[idxf[1:]] >>> zip(vmin,vmax) [(-5, -3), (1, 1), (1, 9), (255, 258), (10001, 10004)] Josef _______________________________________________ Numpy-discussion mailing list Numpy-discussion@scipy.org http://mail.scipy.org/mailman/listinfo/numpy-discussion
