polar calculates the left polar decomposition of a matrix.
polar Takes a matrix X, of dimensions n by
p, and returns two matrices P and Z such that
X = PZ. P is a symmetric positive definite matrix of
dimension n by n and Z is an n by p
matrix with orthonormal rows.
P A n by n symmetric positive definite
Z A n by p matrix with orthonormal rows.
X == P %*% Z, up to numerical precision.
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