Hello everyone,

I want to solve a linear system. I have a vandermonde matrix in a linear system. I figured out i should solve it with `real[int] sol = A^-1 * b`

as suggested in the documentation, but i get the following error :

```
MATERROR 1 : VirtualMatrix:: no solver ?????
current line = 90
call interpolation at line 95
Exec error : MATERROR
-- number :1
Exec error : MATERROR
-- number :1
err code 8 , mpirank 0
```

Why do i have to specify a solver, i thought this is regular matrix inversion (gauss-jordan?). How should i specify the solver ?

Here is the code :

```
func real[int] interpolation(real[int] A, real[int] B, real pente) {
matrix vandermonde =
[[A [0] ^ 3, A [0] ^ 2, A [0], 1], [B [0] ^ 3, B [0] ^ 2, B [0], 1],
[3 * A [0] ^ 2, 2 * A [0], 1, 0], [3 * B [0] ^ 2, 2 * B [0], 1, 0]];
real[int] sndmembre = [ A[1], B[1], 0, pente ];
real[int] sol = vandermonde ^ -1 * sndmembre;
return sol;
}
real[int] p10 = p1 + departChauffe;
real[int] coeffs = interpolation(p1, p10, pente);
```

Thank you for your help