For convenience only, extracting a specific matrix from the "Matrices" element of a 'VCA' object if this matrix exists.
... (VCA) object
... (character) string specifying the matrix to be extracted
When 'mat="Z"' the design matrix of random effects will be returned. If one is interested in the design matrix of random effects for a specific variance component use a name like "Z" + NAME, where NAME has to be equal to the name of the VC in the 'VCA' object (see examples). The same applies to the A-matrices in the quadratic forms, use "A" + NAME for extracting a specific A-matrix.
(matrix) as requested by the user
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