time   calls  line
                  1 function c = dot(a,b,dim)
                  2 %DOT  Vector dot product.
                  3 %   C = DOT(A,B) returns the scalar product of the vectors A and B.
                  4 %   A and B must be vectors of the same length.  When A and B are both
                  5 %   column vectors, DOT(A,B) is the same as A'*B.
                  6 %
                  7 %   DOT(A,B), for N-D arrays A and B, returns the scalar product
                  8 %   along the first non-singleton dimension of A and B. A and B must
                  9 %   have the same size.
                 10 %
                 11 %   DOT(A,B,DIM) returns the scalar product of A and B in the
                 12 %   dimension DIM.
                 13 %
                 14 %   Class support for inputs A,B:
                 15 %      float: double, single
                 16 %
                 17 %   See also CROSS.
                 18 
                 19 %   Copyright 1984-2010 The MathWorks, Inc. 
                 20 %   $Revision: 5.13.4.4 $  $Date: 2010/08/23 23:13:02 $
                 21 
                 22 % Special case: A and B are vectors and dim not supplied
          1000   23 if ismatrix(a) && ismatrix(b) && nargin<3 
          1000   24    if min(size(a))==1, a = a(:); end 
  0.01    1000   25    if min(size(b))==1, b = b(:); end 
          1000   26 end; 
                 27 
                 28 % Check dimensions
  0.01    1000   29 if any(size(a)~=size(b)), 
                 30    error(message('MATLAB:dot:InputSizeMismatch'));
                 31 end
                 32 
          1000   33 if nargin==2, 
          1000   34   c = sum(conj(a).*b); 
                 35 else
                 36   c = sum(conj(a).*b,dim);
                 37 end