[NumPy-Tickets] [NumPy] #1862: improvement of index notation in einsum

NumPy Trac numpy-tickets@scipy....
Wed Jun 8 05:15:13 CDT 2011

#1862: improvement of index notation in einsum
 Reporter:  wieland                  |       Owner:  somebody   
     Type:  enhancement              |      Status:  new        
 Priority:  normal                   |   Milestone:  Unscheduled
Component:  numpy.core               |     Version:  1.6.0      
 Keywords:  einsum, index, notation  |  
 I suggest some small and very natural improvements on the exceptional
 index notation of einsum.

 1) Given an N-dimensional array A and a 1-dimensional array B, the
 following code throws an error:
 Instead one has to write an (empty) ellipsis for B,
 which just obscures the real index summation.

 2) At the moment, all indices to sum over have to be made explicit.
 However, I claim that
 is. as an example, naturally equivalent to
 (if the dimensions of A and B are appropriate). In the same way, in
 you sum over the other axes of B.

Ticket URL: <http://projects.scipy.org/numpy/ticket/1862>
NumPy <http://projects.scipy.org/numpy>
My example project

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