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2017-08-03 19:21:25 +0100 commented answer how can i define a matrix product like a summation

Thank you so much this is exactly i want

2017-08-03 09:01:55 +0100 asked a question how can i define a matrix product like a summation

first, my mother tongue is not English but I try it, my problem is that if I define a symbolic matrix V such that,

var('V_11,V_12,V_13,V_21,V_22,V_23,V_31,V_32,V_33')

V = matrix(SR,3,3,[V_11,V_12,V_13,V_21,V_22,V_23,V_31,V_32,V_33])

and then I define

P = [V[a,k]*V[b,k]*V[a,j]*V[b,j] for k in [0,1,2] for j in  [0,1,2]]

But if I evaluate, for example

P(a=0,b=1)

but the code is not work can someone help me?