Commit fb82805a authored by Martin Reinecke's avatar Martin Reinecke
Browse files

fix issue #242

parent f6d28ab7
......@@ -18,6 +18,7 @@
import numpy as np
from .linear_operator import LinearOperator
from .diagonal_operator import DiagonalOperator
from .endomorphic_operator import EndomorphicOperator
from .scaling_operator import ScalingOperator
......@@ -46,6 +47,10 @@ class SandwichOperator(EndomorphicOperator):
cheese: EndomorphicOperator
the cheese part
if not isinstance(bun, LinearOperator):
raise TypeError("bun must be a linear operator")
if cheese is not None and not isinstance(cheese, LinearOperator):
raise TypeError("cheese must be a linear operator")
if cheese is None:
cheese = ScalingOperator(1.,
op = bun.adjoint*bun
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