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Detect in simulink if the current and past 4 values are same or not

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Abubakar Muqaddas
评论： Azzi Abdelmalek 2015-7-2
Hi, I am interested in designing a simulink block which detects if the past 4 and the current input values are same or not. How to do it using the delay blocks and relational operators since the relational operators take only two inputs at a time?

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采纳的回答

Titus Edelhofer
Titus Edelhofer 2015-7-2
You can use 4 delay blocks, and feed x_t and x_{t-1} into one relational block, x_{t-1} and x_{t-2} into the next relational block, and then use AND blocks to combine.
Titus

更多回答（2 个）

Anthony Poulin
Anthony Poulin 2015-7-2
Hello,
Do the picture attached solve your question?
Azzi Abdelmalek
Azzi Abdelmalek 2015-7-2
编辑：Azzi Abdelmalek 2015-7-2
You can use Matlab function without any delay block.
function y = fcn(u)
%#codegen
persistent u1 u2 u3 u4
if isempty(u1)
[u1,u2,u3,u4]=deal(0)
end
y=isequal(u,u1,u2,u3,u4)
u4=u3
u3=u2
u2=u1
u1=u
Or
function y = fcn(u)
%#codegen
persistent u1
if isempty(u1)
u1=zeros(1,4)
end
a=[u u1];
y=~any(diff(a));
u1=[u1(2:4) u];

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