Acces workspace of model using sim command in parfor loop

I want to acces the workspace of a model I'm running with the sim comment. I want to set a parameter with assigning or setparam. How can I refer to that workspace? (this should all be performed insite a parfor loop that executes the external model several times with this parameter changing every time the loop is executed)

Answer 1

[Azzi Abdelmalek]

assignin('base', 'var',value)

[Bert Van den Zegel]

Doesn't that assign the variable to the main workspace? It has to be assigned to the workspace of the model that's going to be called with a sim comment. Code shoud be something like:

parfor i=1:N
assign i to a constant block in externalmodel
[t,x,y1,y2] = sim(external model,[starttime,stoptime]
Y1=[Y1 y1];
Y2=[Y2 y1];
end

But whatever I try, it either can't find the constant block, has transparancy errors...