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permutation - implemented general antisymmetrizer

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This commit is contained in:
Jiri Pittner 2024-01-17 22:53:59 +01:00
parent 32f2a1abd5
commit 8bc2179f3b
3 changed files with 63 additions and 15 deletions
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40
permutation.cc
View File

@ -440,8 +440,6 @@ static NRPerm<T> *_perm2;
template <typename T>
static const T *pclasses2;
template <typename T>
static T *_pperm;
static int sameclass;
@ -454,7 +452,7 @@ if(n<=_n2<T>)
T c=pclasses2<T>[n];
for(i=1;i<=_n2<T>;i++)
{
if(_pperm<T>[i]>=1) goto skipme; /*place already occupied*/
if((*_perm2<T>)[i]>=1) goto skipme; /*place already occupied*/
if (sameclass)
{
if(sameclass==1 && c!=pclasses2<T>[i]) goto skipme;
@ -463,14 +461,14 @@ if(n<=_n2<T>)
{
T j,k;
for(j=i+1; j<=_n2<T>; j++)
if((k=_pperm<T>[j])>=1)
if((k=(*_perm2<T>)[j])>=1)
if(/* automatically fulfilled k<n &&*/ c==pclasses2<T>[k]) goto skipme;
}
}
/*put it there and next number*/
_pperm<T>[i]=n;
(*_perm2<T>)[i]=n;
permg2(n+1);
_pperm<T>[i]=0;
(*_perm2<T>)[i]=0;
skipme:;
}
}
@ -493,7 +491,6 @@ _n2<T> = this->size();
_callback2<T> =callback;
_sumperm2=0;
_perm2<T> = this;
_pperm<T> = &(*this)[1]-1;
pclasses2<T> = &classes[1]-1;
sameclass=restriction_type;
permg2<T>(1);
@ -505,22 +502,25 @@ static PermutationAlgebra<T,T> *list_restricted_return;
static PERM_RANK_TYPE list_restricted_index;
static bool list_restricted_invert;
template <typename T>
static void list_restricted_callback(const NRPerm<T> &p)
{
(*list_restricted_return<T>)[list_restricted_index].weight=p.parity();
(*list_restricted_return<T>)[list_restricted_index].perm=p;
(*list_restricted_return<T>)[list_restricted_index].copyonwrite();
(*list_restricted_return<T>)[list_restricted_index].perm= list_restricted_invert?p.inverse():p;
(*list_restricted_return<T>)[list_restricted_index].perm.copyonwrite();
++list_restricted_index;
}
template <typename T>
PermutationAlgebra<T,T> NRPerm<T>::list_restricted(const NRVec_from1<T> &classes, int restriction_type)
PermutationAlgebra<T,T> NRPerm<T>::list_restricted(const NRVec_from1<T> &classes, int restriction_type, bool invert)
{
PERM_RANK_TYPE number = this->generate_restricted(NULL,classes,restriction_type);
PermutationAlgebra<T,T> ret(number);
list_restricted_return<T> = &ret;
list_restricted_index=0;
list_restricted_invert=invert;
generate_restricted(list_restricted_callback,classes,restriction_type);
return ret;
}
@ -2040,6 +2040,25 @@ return r;
}
template<typename T>
PermutationAlgebra<T,T> general_antisymmetrizer(const NRVec<NRVec_from1<T> > &groups, int restriction_type, bool inverted)
{
PermutationAlgebra<T,T> r;
int ngroups=groups.size();
if(ngroups==0) return r;
NRVec<PermutationAlgebra<T,T> > lists(ngroups);
for(int i=0; i<ngroups; ++i)
{
int ni = groups[i].size();
NRPerm<T> tmp(ni);
lists[i] = tmp.list_restricted(groups[i],restriction_type,inverted);
}
//cross-product the lists
r=lists[0];
for(int i=1; i<ngroups; ++i) r= r&lists[i];
return r;
}
/***************************************************************************//**
* forced instantization in the corresponding object file
@ -2053,6 +2072,7 @@ template class Partition<T>; \
template class YoungTableaux<T>; \
template class Sn_characters<T>; \
template class CycleIndex<T>; \
template PermutationAlgebra<T,T> general_antisymmetrizer(const NRVec<NRVec_from1<T> > &groups, int, bool); \
template std::istream & operator>>(std::istream &s, CyclePerm<T> &x); \
template std::ostream & operator<<(std::ostream &s, const CyclePerm<T> &x); \
template std::ostream & operator<<(std::ostream &s, const CompressedPartition<T> &x); \

12
permutation.h
View File

@ -76,7 +76,7 @@ public:
PERM_RANK_TYPE generate_all2(void (*callback)(const NRPerm<T>&)); //recursive method, also not lexicographic
PERM_RANK_TYPE generate_all_lex(void (*callback)(const NRPerm<T>&)); //generate in lex order using next()
PERM_RANK_TYPE generate_restricted(void (*callback)(const NRPerm<T>&), const NRVec_from1<T> &classes, int restriction_type=0);
PermutationAlgebra<T,T> list_restricted(const NRVec_from1<T> &classes, int restriction_type=0); //weight is set to parity (antisymmetrizer) by default
PermutationAlgebra<T,T> list_restricted(const NRVec_from1<T> &classes, int restriction_type=0, bool inverted=false); //weight is set to parity (antisymmetrizer) by default
PERM_RANK_TYPE rank() const; //counted from 0 to n!-1
NRVec_from1<T> inversions(const int type, PERM_RANK_TYPE *prank=NULL) const; //inversion tables
explicit NRPerm(const int type, const NRVec_from1<T> &inversions); //compute permutation from inversions
@ -94,8 +94,8 @@ NRVec_from1<X> applypermutation(const NRPerm<T> &p, const NRVec_from1<X> &set, b
if(p.size()!=set.size()) laerror("size mismatch in applypermutation");
#endif
NRVec_from1<X> r(set.size());
if(inverse) for(int i=1; i<p.size(); ++i) r[p[i]] = set[i];
else for(int i=1; i<p.size(); ++i) r[i] = set[p[i]];
if(inverse) for(int i=1; i<=p.size(); ++i) r[p[i]] = set[i];
else for(int i=1; i<=p.size(); ++i) r[i] = set[p[i]];
return r;
}
@ -190,8 +190,6 @@ public:
};
//TODO@@@ permutationalgebra for Kucharski style antisymmetrizers
extern PERM_RANK_TYPE factorial(const int n);
extern PERM_RANK_TYPE binom(int n, int k);
@ -392,5 +390,9 @@ return r;
}
template<typename T>
PermutationAlgebra<T,T> general_antisymmetrizer(const NRVec<NRVec_from1<T> > &groups, int restriction_type=0, bool inverted=false);
}//namespace
#endif

26
t.cc
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@ -3083,8 +3083,34 @@ if(!dif.is_zero()) laerror("error in gf 2^n sqrt");
}
if(0)
{
int n;
cin>>n;
NRPerm<int> p(n);
PermutationAlgebra<int,int> a=p.list_all();
for(int i=0; i<a.size(); ++i)
if(a[i].weight!=a[i].perm.parity()) laerror("internal error in parity");
}
if(1)
{
//this is kucharskiP antisymmetrizer just without parsing the input
NRVec<NRVec_from1<int> > groups;
cin >> groups;
int ntot=0;
for(int i=0; i<groups.size(); ++i) ntot+=groups[i].size();
NRVec_from1<string> indices(ntot);
cin >>indices;
PermutationAlgebra<int,int> a=general_antisymmetrizer(groups,-2,true);
for(int i=0; i<a.size(); ++i)
{
cout << (a[i].weight==1?'+':'-');
NRVec_from1<string> pindices=applypermutation(a[i].perm,indices,false);
for(int j=1; j<=pindices.size(); ++j) cout <<pindices[j];
cout <<endl;
}
}
}