Not sure what you are after. I assumed step function at n positions with applitudes 1:6
z=1:6;
n=0:5;
x=-1:.1:10;
scatter(x,d(x,z,n))
function y=d(x,z,n)
y=zeros(size(x));
for k=1:length(n)
y(ismember(x,n(k)))=z(k);
end
end
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