matvec(self, x)
Performs the operation y=A*x where A is an MxN linear operator and x is a column vector or 1-d array.
This matvec wraps the user-specified matvec routine or overridden _matvec method to ensure that y has the correct shape and type.
An array with shape (N,) or (N,1).
A matrix or ndarray with shape (M,) or (M,1) depending on the type and shape of the x argument.
Matrix-vector multiplication.
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scipy.sparse.linalg._interface.LinearOperator
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