column2by2()

template<typename CoeffRing>

void SMat< CoeffRing >::column2by2	(	size_t	c1,
		size_t	c2,
		elem	a1,
		elem	a2,
		elem	b1,
		elem	b2 )

Definition at line 974 of file smat.hpp.

{
  // Make first column: v1 = a1*c1+a2*c2
  sparsevec *v1 = vec_copy(columns_[c1]);
  sparsevec *v2 = vec_copy(columns_[c2]);
  vec_scale(v1, a1);
  vec_scale(v2, a2);
  vec_add_to(v1, v2);
 
  // Second column: w1 = b1*c1 + b2*c2
  sparsevec *w1 = columns_[c1];
  sparsevec *w2 = columns_[c2];
  vec_scale(w1, b1);
  vec_scale(w2, b2);
  vec_add_to(w1, w2);
 
  // Set the matrices:
  columns_[c1] = v1;
  columns_[c2] = w1;
}

References columns_, vec_add_to(), vec_copy(), and vec_scale().

Referenced by MatElementaryOps< SMat< RT > >::column2by2().