Ok this is not going to serve your purpose. There is a reason its called simulation Cycle/Cycle time. The whole model (including function blocks) get executed once in each cycle and this is repeated again in next cycle and so on. So your variables D and N will always get reinitialized to zero in each simulation cycle. Now the problem is not reinitialization of D because it gets reassigned depending on value of N as per if-else conditions. But because of the reinitialization of N to zero, the only condition that will pass in each cycle is
if N==0
D = DPold(1);
end
so in the end you will get only one value of D throughout your simulation which will be D=DPold(1)=0.2
"I plan to set N as some sort of delay in the form of a 'counter' to ensure that each of the D values I set will be fed into my simulation"- From this statement I assume that all you want to do is output different values of D in your simulation as a function of time. Not sure what is 'P' and what 'Pold' is doing in the function. One way you can do this is to give clock as an input to your function block. You can define your function something like this:
function D = BAT(time)
D=0; %initlalize
%% declare all variables %%
DPold = [0.2;0.4;0.6;0.8];
if time<=2
D = DPold(1); % output first value till 2 sec
elseif time>2 && time<=4
D = DPold(2); % output second value after 2 sec till 4 sec
elseif time<4 && time<=6
D = DPold(3);% output third value after 4 sec till 6 sec
elseif time<6 && time<=8
D = DPold(4);% output fourth value after 6 sec till 8 sec
end
end
Correct me if my understanding of your problem statement is not right.
