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In two subprograms the functions DNRM2( ) and DDOT( ) are not declared to be DOUBLE PRECISION as they should be. In program unit DESCRB(), sequence numbers QRUP 139 and QRUP 140 should be modified to read: REAL A, ASS, SDOT, COL, GLRMAX, OMEGA C!!H DOUBLE PRECISION A, ASS, DDOT, COL, GLRMAX, OMEGA In program unit ORTCOL(), sequence numbers QRUP 762 and QRUP 763 should be modified to read: REAL SDOT, SNRM2, OMEGA, ONE, ONENEG, Q, RHO C!!t! DOUBLE PRECISION DDOT, DNRM2, OMEGA, ONE, ONENEG, Q, RHO

Remark on “Algorithm 580: QRUP: A Set of FORTRAN Routines for Updating QR Factorizations”