Excluding one vector from another vector with repetition

I want to get a new vector that has elements of S excluding the values in C with repetition.

S=[1 3 0 2 0 0] C=[0 2] B=setdiff(S,C) B=[1 3] while I need the output as [1 3 0 0]. I need the other zeros in the output but setdiff removes all the zeros. I also tried ismember function and it has the same result.

B=S(~ismember(S,C)) B=[1 3]

To make it clearer, I need to exclude a from s with repetition while keeping the same order of elements in s.

Answer 1

[Paolo]

 S=[1 3 0 2 0 0];
 C=[0 2];
 [~,col] = ismember(C,S);
 S(col) = [];

 S =

     1     3     0     0

[Sarah Ansari]

Thank you for your quick and perfect answer.

[Stephen23]

+1 that is really neat! Good idea, Paolo.

[Paolo]

Happy to help Sarah, and thank you Stephen :)

[IBM watson]

Hi. I used your code in my algorithm and i got this:

boxes0: subscripts must be either integers 1 to (2^63)-1 or logicals

• boxes is the main vector like your S.

Could you help me to fix this please?

[Alexander Gallard]

This method didn't work for me if my C was, say, [0,0,2]

If I want to remove two zeros this wasn't quite cutting it. Any ideas?

Kind of an old thread but would love a pointer! (:

[Jan]

Please open a new thread, because this is a different question. Include some examples, which clarify uniquely, which outputs are wanted for which input.

[Bruno Luong]

Paolo's solution breaks if C contains elements not in S.

Answer 2

[Bruno Luong]

From Alexander Gallard above comment (I agree he should open a new thread)

"This method didn't work for me if my C was, say, [0,0,2]

If I want to remove two zeros this wasn't quite cutting it.'

A=[3 1 0 2 0 0 4];
B=[0 7 0 2];

D = DiffRep(A,B)

function D=DiffRep(A,B)
D=A(~ismember(count(A),count(B),'rows'));
end

function C=count(A)
A=A(:);
[C,i]=sort(A);
j=find([true;diff(C)]);
lgt=diff(j);
c=ones(size(A));
c(j(2:end))=1-lgt;
c=cumsum(c);
c(i)=c;
C=[A,c];
end

gives result

A =

     3     1     0     2     0     0     4


B =

     0     7     0     2


D =

     3     1     0     4