On Tue, Apr 29, 2008 at 2:18 PM, Anne Archibald
On 29/04/2008, Keith Goodman
wrote: In my use i is most commonly an array (i = M.where(y.A)[0] where y is a nx1 matrix), sometimes a list, and in ipython when debugging or first writing the code, a scalar. It would seem odd to me if x[i,:] returned different types of objects based on the type of i:
array index idx = M.where(y.A)[0] where y is a nx1 matrix x[dx,:] --> matrix
list index idx = [0] x[idx,:] --> matrix?
scalar index idx = 0 x[idx,:] --> not matrix
It is actually pretty unreasonable to hope that
A[0]
and
A[[1,2,3]] or A[[True,False,True]]
should return objects of the same rank.
Why it unreasonable to hope that x[0,:] and x[0, [1,2,3]] or x[0, [True,False,True]] where x is a matrix, continue to return matrices?