code: public void set( int row , int col , double real , double imaginary ) {
          if( imaginary == 0 ) {
              set(row,col,real);
          } else {
              ops.set(mat,row,col, real, imaginary);
          }
      }
docs: Used to set the complex value of a matrix element.
  @param row The row of the element.
  @param col The column of the element.
  @param real Real component of assigned value
  @param imaginary Imaginary component of assigned value