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Update substitutions if a column is transformed #1848

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merged 5 commits into from
Aug 4, 2024
Merged

Update substitutions if a column is transformed #1848

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e3708c7
Update relevant substitutions if a variable is transformed
fwesselm Jul 16, 2024
91da631
Take scale into account
fwesselm Jul 17, 2024
8966bc0
Update analogous to variable bounds
fwesselm Jul 17, 2024
d318f65
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fwesselm Jul 17, 2024
c468ded
Merge branch 'latest' of https://github.com/ERGO-Code/HiGHS into pres…
fwesselm Aug 4, 2024
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10 changes: 10 additions & 0 deletions src/mip/HighsImplications.h
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Original file line number Diff line number Diff line change
Expand Up @@ -109,6 +109,7 @@ class HighsImplications {
double vlbconstant);

void columnTransformed(HighsInt col, double scale, double constant) {
// Update variable bounds affected by transformation
if (scale < 0) std::swap(vubs[col], vlbs[col]);

auto transformVbd = [&](HighsInt, VarBound& vbd) {
Expand All @@ -119,6 +120,15 @@ class HighsImplications {

vlbs[col].for_each(transformVbd);
vubs[col].for_each(transformVbd);

// Update substitutions affected by transformation
for (auto& substitution : substitutions) {
if (substitution.substcol == col) {
substitution.offset -= constant;
substitution.offset /= scale;
substitution.scale /= scale;
}
}
}

std::pair<HighsInt, VarBound> getBestVub(HighsInt col,
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