Hi!

In my program, I have to solve a matricial equation of the type M*a = ra. Where the entries are the Matrix M (10 * 10) and the vector ra. I read the chapter 16.6 Matrix Decompositions and I found the command TVectorD Solve(const TVectorD &b,Bool_t &ok) which is the most direct manner to calculate the solution. But how to add the matrix A as a parameter of the command Solve. In this example there is only the vector b as the function argument? Do I have to apply the LU decompostion before in the M matrix?

Is that the correct way to solve the matricial equation M*a = ra?

```
TDecompLU lu(M);
Bool_t ok;
lu.Solve(ra,ok);
```