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