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====== ToMatrix ======

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//M = ResponseFunction.ToMatrix(G)// returns a matrix representation of $G$ such that $$ G(\omega,\Gamma) = A_0 + B_0^* \left( \frac{1}{(\omega+\mathrm{i}\Gamma/2) - M} \right)_{[1..Blocksize,1..Blocksize]} B_0^T$$
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We only need the left top matrix of dimension //Blocksize// of the inverse of the matrix $(\omega+\mathrm{i}\Gamma/2) - M$. As a result the matrix $M$ is not uniquely determined. Any unitary transformation of the bath, i.e. all rows and columns with index larger than //Blocksize// does not change $G$. As a consequence $M$ is not uniquely defined. The exact form of $M$ returned depends on the type used for the response function. See [[documentation:language_reference:objects:responsefunction:functions:totightbinding|ToTightbinding]] for more information on the relation between the internal representations of response functions and [[documentation:language_reference:objects:responsefunction:functions:totightbinding|tight binding Hamiltonians]], full matrix representations, or [[documentation:language_reference:objects:responsefunction:functions:tooperator|operators]]. 
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===== Table of contents =====
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