On 9 Sep, 03:45, hi_roger <rechardc...@gmail.com> wrote: > hello, i want to ask a question about numpy. > > i know how to select a submatrix using the slice object in numpy. But > how can i select a submatrix > A[i1,i2,i3;j1,j2,j3] (elements in A on line i1,i2,i3 and column > j1,j2,j3 , and i1,i2,i3,j1,j2,j3 are all arbitrary numbers ) > The submatrix must share data memory with original matrix.
So the only way to do this is to make an ndarray subclass that overloads __getitem__, __setitem__, and __iter__, and takes care of the mapping into A. Thus you get a double indirection. -- http://mail.python.org/mailman/listinfo/python-list
