How to get V(n+0.5) in matlab OR Simulink?

Hello, Imagine a situation in which you are inputing two changing values into a function block from other block in simulink and you want input1(n+0.5),input2(n+0.5) inside the block to process further.

Is there any block to perform this operation or how to perform this behavior in coding inside function block?

Thanks in advance.

[Chunru]

You can do input1(n-0.5),input2(n-0.5) by delay block. But you cannot do input1(n+0.5),input2(n+0.5) , which is not casual.

[Walter Roberson]

Right, no future times; if you find yourself needing a future time then you need to put delays on everything else so that you are never referencing the future.

[Uzair Amin]

Can't I use step fuction with step time = -0.5 and multiplying that with input V(n)

[Walter Roberson]

If that were able to work at all, you would need a positive step time in order to example input1(n+0.5). You would be forecasting the development of input1 in the future. But can you rely on the forecast?

  function yes_no = will_I_lie(n)
    persistent last_n_forecast last_yes_no
    if n == last_n_forecast
       yes_no = ~last_yes_no;
    end
    future_n = n + 0.5;
    future_yes_no = will_I_lie_in_the_future(future_n);
    last_n_forecast = future_n;
    last_yes_no = future_yes_no;
    yes_no = rand() < 0.5;
  end
  

... when time n+0.5 comes around, I will lie if and only if I did not lie when I forecast about time n+0.5 . But I already used the information about the future, and now all my forecasts are messed up because I did not act in the future the way that I forecast I would act in the future...