function E = EM2(n,c,i)
% EM2 elementary matrix of type II.
%
%   EM2(n,c,i) is an n-by-n matrix that multiplies the 
%   i-th row of any n-by-m matrix A by the scalar c 
%   (when multiplying A on the left).
%
%   Matt Kawski 7-10-99
%   http://math.la.asu.edu/~kawski
%   kawski@asu.edu
%
E = eye(n);
   if ( i > n ) 
   disp('First index exceeds matrix dimension')
else
   E(i,i) = c;   
end