Hi,
You can do a for loop, followed by if to test if the current number in the loop is at least 4 units higher. If that is the case, you save the current number in the loop to a new array (B in my code) which will store your values. I used a variable "c" to store the last saved number, however you could use the last number of B: c=B(length(B))
It gives the current code, with the initial conditions setup:
B=A(1);
c=A(1);
for i=1:length(A)-1,
if c+4<=A(i+1),
B=[B A(i+1)];
c=A(i+1);
end;
end
Note your initial result in your post was incorrect, correct one is here:
B =
1 5 9 13 18 23 28 32 36 40
