display 4 consecutive numbers in array

I have the Array a= 9 10 11 12 17 18 19 20 23 24 How can i get the code to display when the 4 indices are consecutive and when they appear. example: 9 10 11 12 and 17 18 19 20

Answer 1

[Guillaume]

Strangely enough, strfind also find patterns in numeric arrays:

a = [9 10 11 12 17 18 19 20 23 24];
indices = strfind(diff(a), [1 1 1])

See also Loren's blog on the subject of finding patterns for alternative algorithms.

[Stephen23]

Very tidy solution.

Answer 2

[David Sanchez]

a= [9 10 11 12 17 18 19 20 23 24];

for k=1:(length(a)-3) % k=2
    if a(k:k+3)==(a(k):a(k)+3)
        fprintf('repeition in position %g: \n',k);
        disp(a(k:k+3));
    end
end

[Kole]

Error using == Matrix dimensions must agree.

Error in hw3 (line 7) if a(i:i+3)==(a(i):(a(i)+3))

[Kole]

this is what i was going for but couldnt get it to work