The Value of a datagridviewcell is never a nullable value. Success Cor Tuesday, December 15, 2015 4:01 PM Check this: prettyprint 复制 If (String.IsNullOrWhiteSpace(DataGridView1.CurrentCell.Value.ToString())) Then End If Fouad Roumieh Fouad, This code is very much just C# copied code...
The null space of a matrix A is the set of vectors that satisfy the homogeneous equation A\mathbf{x} = 0. Unlike the column space \operatorname{Col}A, it is not immediately obvious what the relationship is between the columns of A and...