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# scipy.optimize.LbfgsInvHessProduct.matvec

`LbfgsInvHessProduct.``matvec`(x)

  Matrix-vector multiplication.

  Performs the operation y=A*x where A is an MxN linear operator and x is a column vector or 1-d array.

  Parameters: | x : {matrix, ndarray} An array with shape (N,) or (N,1).
  Returns: | y : {matrix, ndarray} A matrix or ndarray with shape (M,) or (M,1) depending on the type and shape of the x argument.

  Notes

  This matvec wraps the user-specified matvec routine or overridden _matvec method to ensure that y has the correct shape and type.