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small NormalToricVarieties fix to retain CoefficientRing and Variable #3442

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merged 3 commits into from
Aug 29, 2024
Merged

small NormalToricVarieties fix to retain CoefficientRing and Variable #3442

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44c3c08
added CoefficientRing option to toric blowup
Devlin-Mallory Aug 27, 2024
36f083d
all instances of normalToricVariety now have CoefficientRing
Devlin-Mallory Aug 27, 2024
3a029f8
added caching of base in toricBlowup in all cases
Devlin-Mallory Aug 28, 2024
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6 changes: 3 additions & 3 deletions M2/Macaulay2/packages/NormalToricVarieties/ToricVarieties.m2
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Original file line number Diff line number Diff line change
Expand Up @@ -630,7 +630,7 @@ regularSubdivisionLocal (NormalToricVariety, List, List) := (X,s,w) -> (
coneList = drop (coneList,{k,k}) | coneList')
);
if coneList == max X then return X;
Y := normalToricVariety (rayList, coneList);
Y := normalToricVariety (rayList, coneList, CoefficientRing => X.cache.CoefficientRing, Variable => X.cache.Variable);
Y.cache.Weights = apply (#rayList, i -> wtg i);
Y
);
Expand Down Expand Up @@ -693,13 +693,13 @@ toricBlowup (List, NormalToricVariety, List) := NormalToricVariety => (s, X, v)
if member (s#0,t) then continue
else sort (t | s)
);
return normalToricVariety (rays X, coneList | coneList')
return normalToricVariety (rays X, coneList | coneList', CoefficientRing => X.cache.CoefficientRing, Variable => X.cache.Variable)
);
coneList' = for t in clStar list (
if all (s, i -> member (i,t)) then continue
else t | {n}
);
Z := normalToricVariety (rays X | {v}, coneList | coneList');
Z := normalToricVariety (rays X | {v}, coneList | coneList', CoefficientRing => X.cache.CoefficientRing, Variable => X.cache.Variable);
Z.cache.toricBlowup = X;
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Do you know why the base X is cached here but not above?

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Not sure I understand the question - where above would/should X be cached?

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Like 5 lines above, the other case where a toric variety is constructed and returned.

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Oh, I see now - I'm not sure why that differs. I could add the base into the cache, unless @ggsmith or anyone else has objections?

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For consistency, I think that the base toric variety should also be cached in the #s === 1 case. @Devlin-Mallory can you also make this change?

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Done!

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These changes look good to me.

Z
);
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