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some tests of matrix log

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Jiri Pittner
2026-03-03 15:26:14 +01:00
parent 1735b35909
commit dfa9369779
1 changed files with 29 additions and 1 deletions
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30
t.cc
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@@ -4707,7 +4707,7 @@ cout <<x;
cout <<"Error = "<< (a*x-b).norm()<<endl;
}
if(1)
if(0)
{
NRMat<double> a;
NRMat<double> b;
@@ -4718,5 +4718,33 @@ cout <<x;
cout <<"Error = "<< (a*x-b).norm()<<endl;
}
if(0)
{
int n;
cin>>n;
NRMat<double> a(n,n);
a.randomize(.5);
NRMat<double> ae = exp(a);
NRMat<double> aa = log(ae);
cout <<a;
cout <<aa;
cout <<"Error = "<<(a-aa).norm()<<endl;
}
if(1)
{
int n;
cin>>n;
NRMat<double> a(n,n);
a.randomize(.5);
NRMat<double> ax = a.transpose()*a;
NRMat<double> al = log(ax);
NRMat<double> aa = exp(al);
cout <<ax;
cout <<aa;
cout <<"Error = "<<(ax-aa).norm()<<endl;
}
}//main