how to concatenate vetcors

I have 2 vectors v=[1 2 3 4 5 6 1 2 3] et k=[4 5 6 7 8 9].

I need to find the common part of the vectors which is [4 5 6] and replace it with a vector temp= [10 11 12].

The idea is to obtain at the end the vector cat= [1 2 3 10 11 12 1 2 3 7 8 9].

Please note that the vectors v and k don't have the same size.

Can anyone advise me with a method ?

Thanks in advance

[Stephen23]

" find the common part of the vectors"

Is there always one common subvector? How long can it be? Is there always a common subvector? Do you want all common subvectors, or just the longest one? Does the replacement vector always have the same length as the original subvector?

Answer 1

[Jan]

v = [1 2 3 4 5 6 1 2 3]
k = [4 5 6 7 8 9]
c = [4 5 6]

in_v = strfind(v, c);  % Replace c in v
if ~isempty(in_v)
  for ic = 1:length(c)
    v(in_v + ic -1) = c(ic);
  end
end

in_k  = strfind(k, c);  % Remove c from k
if ~isempty(in_k)
  match = true(1, length(k));
  for ic = 1:length(c)
    match(in_k + ic -1) = false;
  end
  k = k(match);
end

result = [v, k]

Does this do what you want? Then it can be improved to run faster on demand.

[MARC KATRA]

Thank you !

Answer 2

[Andrei Bobrov]

t1 = ismember(k,v);
v(ismember(v,k)) = temp;
out = [v,k(~t1)];