2023-01-23 Version 1.1.0 Modification of the Zlatev pivoting strategy to avoid a problem with the ifort compiler. 2004-07-12 Version 1.0.0 Version numbering added. 1998-07-15 T edit descriptors removed. IQ in ME50BD and ME50CD made assumed size ZTRSV not called for zero-sized array. NP initialized to 0. INFO(4) and INFO(6) in MA50ED made to reflect the situation at the point of failure in the case of insufficient storage. In ME50AD, copy a row forward if there is space at its front, rather than put new entry at front. Makes the result repeatable as LA is altered. 1993-12-06 Minor bug fixed re threshold test for pivots. 1993-09-24 Some IVDEP comments added for speed on the Cray, some minor bugs fixed, default changed to BLAS 3 with block size 32. 1993-05-20 Original version of ME50.