QLNet.Matrix.row C# (CSharp) Метод

        public Vector row(int r)
        {
            Vector result = new Vector(columns_);
            for (int i = 0; i < columns_; i++)
                result[i] = this[r, i];
            return result;
        }

        public virtual double value(double t)
        {
            Matrix m = param_.diffusion(t, new Vector());
            double u = 0;

            m.row(i_).ForEach((ii, vv) => u += vv * m.row(j_)[ii]);
            return(u);
        }