code: public static double dotInnerColumns( DMatrixSparseCSC A , int colA , DMatrixSparseCSC B , int colB,
                                            IGrowArray gw , DGrowArray gx)
      {
          return ImplSparseSparseMult_DSCC.dotInnerColumns(A,colA,B,colB,gw,gx);
      }
docs: Computes the inner product of two column vectors taken from the input matrices.
  
  <p>dot = A(:,colA)'*B(:,colB)</p>
  
  @param A Matrix
  @param colA Column in A
  @param B Matrix
  @param colB Column in B
  @return Dot product