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

2019 5 8
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更新时间：2019 5 8
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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

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madhan ravi
madhan ravi 2019-5-8
编辑：madhan ravi 2019-5-8
T=cell(200,1);
syms kk
for k=1:200;
Q=pk(k)*((l-q).'*z(k)- s.'*y(k));
T{k}=symsum(Q,kk,1,200)
end
bus14
bus14 2019-5-8
As a result I would like to get A func. Which looiks like
Sigma [pk(k)*((l-q).'*z(k)-s.'*y(k))] from k=1:1:200
and put this in another objective function. This is not the output of the code which I am having now, would you now how I can solve this?
Walter Roberson
Walter Roberson 2019-5-8
Which variable is symbolic? symsum() is only for symbolic expressions.
bus14
bus14 2019-5-8
I think k,
now not certain if using symsum is right one to use
I want to create a summation of a function, for 200 instances. With k=1:1:200
so actually pk(1)*((l-q).'*z(1)-s.'*y())+pk(2)*((l-q).'*z(2)-s.'*y(2))+pk(3)*((l-q).'*z(3)-s.'*y(3))]
should I use something else for this?
bus14
bus14 2019-5-8
编辑：bus14 2019-5-8
l=1 q=11 s=2
this is is simplied version of the larger problem
Walter Roberson
Walter Roberson 2019-5-8
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.

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