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^ Matrix power.
Z = X^y is X to the y power if y is a scalar and X is square. If y is an
integer greater than one, the power is computed by repeated
multiplication. For other values of y the calculation
involves eigenvalues and eigenvectors.
Z = x^Y is x to the Y power, if Y is a square matrix and x is a scalar,
computed using eigenvalues and eigenvectors.
Z = X^Y, where both X and Y are matrices, is an error.
C = MPOWER(A,B) is called for the syntax 'A ^ B' when A or B is an
object.