## Version 1.0.0

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### MC58 Estimate rank and ﬁnd independent rows/columns of a sparse unsymmetric or rectangular matrix

To estimate the rank and ﬁnd a nonsingular submatrix of an unsymmetric or rectangular sparse matrix $A$ using Gaussian elimination. The main entry performs a sparse $LU$ factorization of the matrix optionally using rook pivoting. The factors are not returned.