One doubt about inverse of this case of matrix

[lucaslgr]

As you can see below I've tried to inverse this matrix and the answer isn't compatible with Matlab answer.
Do you know why the NaN (Not a number) appear in response?

EigenJS

Matlab

[BertrandBev]

That's a good question! Have you tried in Eigen to see what it yields? Not sure it should have a sensible behaviour in the non invertible cases