Function conjugate_gradient 

pub fn conjugate_gradient<T: ComplexField>(
    out: MatMut<'_, T>,
    precond: impl Precond<T>,
    mat: impl LinOp<T>,
    rhs: MatRef<'_, T>,
    params: CgParams<T::Real>,
    callback: impl FnMut(MatRef<'_, T>),
    par: Par,
    stack: &mut MemStack,
) -> Result<CgInfo<T::Real>, CgError<T::Real>>

executes the conjugate gradient using the provided preconditioner

note

this function is also optimized for a rhs with multiple columns