MATLAB: Parfor and cell array

Question

Suppose I have the following code
p = cell(1,3);
w = zeros(5,3);
p{1} = X; 2 by 2 matrix
p{2} = Y;  2 by 2 matrix
p{3} = Z;  2 by 2 matrix
 parfor k=1:3
   for i=1:5
    w(i,k) = somefunction(variable1, variable2,p{k})
   end
 end

If I remove the parfor, the code runs fine, but if I use the parfor I get the error: Output argument "XXXX" from some other function that is used in "somefunction" was not assigned during call.

Sorry for being very schematic but the actual code is very long has and uses numerous functions.

Answer 1

It works for me:

p = cell(1,3);
w = zeros(5,3);
p{1} = rand(2);
p{2} = rand(2);
p{3} = rand(2);
myFun = @(x,y,z) x + y + sum(z(:));
variable1 = 1;
variable2 = 2;
 parfor k=1:3
   for i=1:5
    w(i,k) = myFun(variable1, variable2,p{k})
   end
 end

I'm afraid you'll have to provide more details about variable1, variable2 and somefunction()