

   MMaattrriixx EExxppoonneennttiiaattiioonn

        mexp(x, t=1, type="spectral decomposition", n=20, k=3)

   AArrgguummeennttss::

          x: A square matrix.

          t: Constant multiplying the matrix.

       type: Algorithm used: spectral decomposition or series
             approximation.

          n: Number of terms in the series expansion.

          k: Constant divisor to avoid over- or underflow
             (series approximation only).

   VVaalluuee::

        `mexp' calculates `exp(t*x)' for the square matrix,
        `x', by spectral decomposition or series expansion.

   AAuutthhoorr((ss))::

        J.K. Lindsey

   EExxaammpplleess::

        x <- matrix(c(1,2,3,4),nrow=2)
        mexp(x)

