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

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 

[madhan ravi]

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]

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]

Which variable is symbolic? symsum() is only for symbolic expressions.

[bus14]

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?

[Walter Roberson]

What size are l, q, s?

[bus14]

l=1 q=11 s=2

this is is simplied version of the larger problem

[Walter Roberson]

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.