Linear Least Squares (LLS) Problems

p?gels solves overdetermined or underdetermined linear systems involving a matrix of full rank.
call psgels (trans, m, n, nrhs, a, ia, ja, desca, b, ib, jb, descb, work, lwork, info)
call pdgels (trans, m, n, nrhs, a, ia, ja, desca, b, ib, jb, descb, work, lwork, info)
call pcgels (trans, m, n, nrhs, a, ia, ja, desca, b, ib, jb, descb, work, lwork, info)
call pzgels (trans, m, n, nrhs, a, ia, ja, desca, b, ib, jb, descb, work, lwork, info)

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