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Fix two issues with ipopt output parsing #3741

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Fix two issues with ipopt output parsing #3741

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12 changes: 11 additions & 1 deletion pyomo/contrib/solver/solvers/ipopt.py
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Original file line number Diff line number Diff line change
Expand Up @@ -62,7 +62,7 @@

# Acceptable chars for the end of the alpha_pr column
# in ipopt's output, per https://coin-or.github.io/Ipopt/OUTPUT.html
_ALPHA_PR_CHARS = set("fFhHkKnNRwstTr")
_ALPHA_PR_CHARS = set("fFhHkKnNRwsStTr")


class IpoptConfig(SolverConfig):
Expand Down Expand Up @@ -613,6 +613,16 @@ def _parse_ipopt_output(self, output: Union[str, io.StringIO]) -> Dict[str, Any]

for line in iter_table:
tokens = line.strip().split()

# The ipopt output squishes the first and second columns
# if the first has a restoration flag and the second has a minus sign,
# like this: 2631r-2.9874883e+03. Catch and avoid it.
first = tokens[0]
if 'r-' in first:
it, obj = first.split('r', 1)
tokens.insert(0, it + 'r')
tokens[1] = obj

if len(tokens) != len(columns):
continue
iter_data = dict(zip(columns, tokens))
Expand Down