MATLAB: How do i avoid repeated value in crossover

gagenetic algorithmMATLAB

please help me in order to make a one point crossover
P1 =
7     5     1     3     6    11    10     8    12     9     4     2
P2 =
3     5     4     6     2     7     9    11     8     1    10    12
than i do a coding like this 
 P1 = RS %RS is an result that i get from parent selection before
 P2 = RS
CrossoverIndex = 6;  
c1 = [P1(1:CrossoverIndex) P2(CrossoverIndex+1:end)]
c2 = [P2(1:CrossoverIndex) P1(CrossoverIndex+1:end)]
then the result i get from the coding is like this
c1 =
7     5     1     3     6    11     9    11     8     1    10    12
c2 =
3     5     4     6     2     7    10     8    12     9     4     2
the result that i get from the coding is wrong because there are same value repeated in c1 number 11, 1 is reapeted and number 2, 4 is missing and also c2 which is 4, 2 is reapeated and mising 11, 1..
what can i do to make the number is not repeated ?

Best Answer

There is no valid 1 point cross-over between P1 and P2 according to those rules.
You can get a valid 1 point cross-over only if you can identify some point, N > 1, such that P1(1:N-1) is a permutation of P2(1:N-1) and P1(N:end) is a permutation of P2(N:end). You can show that cannot happen with those P1 and P2.
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