code: public IVector getVectorFromColumn(int index) {
          IVector result = new IVector(rows);
          for (int i = 0; i < rows; i++) {
              result.realvector[i] = realmatrix[i][index];
              result.imagvector[i] = imagmatrix[i][index];
          }
          return result;
      }
docs: Creates a vector with the content of a column from this matrix