Error reading Fixed format MPS files

[rolfvdhulst]

Highs currently fails to read the MIPLIB 2017 collection instance "rvb-sub". The issue appears to be that the free format incorrectly classifies the file as not fixable, even though the fixed format mps reader can read it just fine. In particular, the MPS file starts with:

NAME          rvb-sub
ROWS
 E  s0        $t5                  0

but the last line is incorrectly classified as not being interpretable in fixed format by the free format reader.

I will submit a PR that fixes this soon.

[jajhall]

Interesting: the problem here is that the file has comments at the end of non-comment lines. I've never seen this feature in an MPS file.

It's possible that this will be done for a free format MPS file, so I can't accept your fix.

The correct fix is to ignore any characters after a $ sign

[jajhall]

Closed by #1920

[jajhall]

The fix causes the MPS reader to fail on models for which there are $ or * characters in row/column names. See #1945

For the time being, revert the fix, so reopen this issue