summation is equivalent to dot product??

*To*: mathgroup at smc.vnet.net*Subject*: [mg74742] summation is equivalent to dot product??*From*: "learner" <freephys at gmail.com>*Date*: Tue, 3 Apr 2007 00:28:26 -0400 (EDT)

Hi, Mathematicers, Comparing the caluclations done by summation and dot product of the matrix, it turns out that they are different, which i initially thought to be equal. what is the equivalent summation form for the dot product?? In[29]:= F[p_,q_,r_,s_]:=p+2q+r-s; In[31]:= MatF=Table[F[p,q,r,s],{p,4},{q,4},{r,4},{s,4}]; In[32]:= c={1,2.1,3,4}; In[37]:= c=2EMatF.c//MatrixForm sumf[ p_, q_] := =E2=88=91r=E2=88=91s F[p, q, r, s]*c[[r]] c[[s]]; In[41]:= Table[sumf[p,q],{p,4},{q,4}]//MatrixForm