Question: _rtable[4456495426]

I am trying to find out the stiffness matrix of composite by using iterative loop that sums over each laminate and adds the result to the previously calculated matrix 

D=null matrix

for i to 4 do Dply := evalf(evalm((1/3)*Q[i]*(z(i+1)^3-z(i)^3))); D := evalm(D+Dply) end do;
evalm(D);

although the values are coming out fine but in the diagonalm elements, it shows the true value + _rtable[4456495426] which I am not able to figure out why is it coming?

 

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