# Undefined function 'symsum' for input arguments of type 'double'.

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bus14 on 8 May 2019
Commented: Walter Roberson on 8 May 2019
Hi, I am getting the error
Undefined function 'symsum' for input arguments of type 'double'.
Error in LoopsumQ2 (line 40)
T=symsum(Q,k,1,200)
I do not understand what this means as I am trying to sum this objective function.
The values of l,q,s,pk(k),y(k),z(k) are all computed already before this for loop takes place.
Is there something wron in my code?
syms k
for k=1:1:200;
Q=pk(k)*((l-q).'*z(k)-s.'*y(k));
T=symsum(Q,k,1,200)
end
bus14 on 8 May 2019
Edited: bus14 on 8 May 2019
l=1 q=11 s=2
this is is simplied version of the larger problem
Walter Roberson on 8 May 2019
If those are constant then the .' operators have no reason to be there so I have to assume that they are vector or 2D array in the real problem. The solution if they are constant is very simple but with them being multivalued I need to think carefully about putting the expression together.