Matrix exponential

- example
`Y = expm(X)`

[1] Higham, N. J., "The Scaling and Squaring
Method for the Matrix Exponential Revisited," *SIAM
J. Matrix Anal. Appl.*, 26(4) (2005), pp. 1179–1193.

[2] Al-Mohy, A. H. and N. J. Higham, "A
new scaling and squaring algorithm for the matrix exponential," *SIAM
J. Matrix Anal. Appl.*, 31(3) (2009), pp. 970–989.

[3] Golub, G. H. and C. F. Van Loan, *Matrix
Computation*, p. 384, Johns Hopkins University Press,
1983.

[4] Moler, C. B. and C. F. Van Loan, "Nineteen
Dubious Ways to Compute the Exponential of a Matrix," * SIAM
Review 20*, 1978, pp. 801–836. Reprinted and updated
as "Nineteen Dubious Ways to Compute the Exponential of a Matrix,
Twenty-Five Years Later," *SIAM Review 45*,
2003, pp. 3–49.

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