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continueing on permutations

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This commit is contained in:
Jiri Pittner
2021-05-19 22:29:47 +02:00
parent 83b9463334
commit 78c94f1e17
9 changed files with 558 additions and 31 deletions
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63
t.cc
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@@ -1989,7 +1989,7 @@ c=a+b;
cout<<c;
}
if(1)
if(0)
{
NRPerm<int> p;
cin >>p;
@@ -1997,8 +1997,67 @@ int n=p.size();
NRVec_from1<double> v(n);
int i;
for(i=1; i<=n; ++i) v[i]=10.*i;
cout <<v.permute(p);
cout <<v.permuted(p);
}
if(0)
{
CyclePerm<int> c;
cin>>c;
cout<<c<<endl;
NRPerm<int> p(c);
cout <<p;
CyclePerm<int> cc(p);
cout <<cc<<endl;
}
if(0)
{
int seed;
int f=open("/dev/random",O_RDONLY);
if(sizeof(int)!=read(f,&seed,sizeof(int))) laerror("cannot read /dev/random");
close(f);
srand(seed);
int n;
cin >>n;
NRPerm<int> p(n);
p.randomize();
cout <<p;
CyclePerm<int> cc(p);
cout <<cc<<endl;
NRPerm<int> pp(cc,n);
cout <<pp;
if(pp!=p) laerror("inconsistency");
NRVec<double> v(n);
for(int i=0; i<n; ++i) v[i]=10.*(i+1);
NRVec<double> vv(v);
v.permuteme(cc);
cout <<v;
NRVec<double> vvv= vv.permuted(pp);
cout<<vvv;
cout<<"error "<<(v-vvv).norm()<<endl;
}
if(1)
{
int seed;
int f=open("/dev/random",O_RDONLY);
if(sizeof(int)!=read(f,&seed,sizeof(int))) laerror("cannot read /dev/random");
close(f);
srand(seed);
int n;
cin >>n;
NRVec<double> v(n);
v.randomize(1.);
NRVec<double> vv(v);
NRPerm<int> p(n);
vv.sort(0,p);
NRVec<double> vvv=v.permuted(p,true);
NRVec<double> v4=vv.permuted(p,false);
cout<<v<<vv;
cout<<vvv<<v4<<p;
cout <<"error "<<(vv-vvv).norm() <<" "<<(v-v4).norm()<<endl;
}
}