ProductSpaceOperator.__getitem__

ProductSpaceOperator.__getitem__(index)[source]

Get sub-operator by index.

Parameters:
indexint or tuple of int

A pair of integers given as (row, col).

Returns:
suboperatorReductionOperator, Operator or 0

If index is an integer, return the row given by the index.

If index is a tuple, it must have two elements. if there is an operator at (row, col), the operator is returned, otherwise 0.

Examples

>>> r3 = odl.rn(3)
>>> pspace = odl.ProductSpace(r3, r3)
>>> I = odl.IdentityOperator(r3)
>>> prod_op = ProductSpaceOperator([[0, I],
...                                 [0, 0]],
...                                domain=pspace, range=pspace)
>>> prod_op[0, 0]
0
>>> prod_op[0, 1]
IdentityOperator(rn(3))
>>> prod_op[1, 0]
0
>>> prod_op[1, 1]
0

By accessing single indices, a row is extracted as a ReductionOperator:

>>> prod_op[0]
ReductionOperator(ZeroOperator(rn(3)), IdentityOperator(rn(3)))