Exclude an element from a vector

I have a vector z which gets elements from another vector c. vector c is a random sample which creates a 5 element vector. I want to know how to exclude an element in vector z which appears twice or more in vector c. By the way , my lecturer does not want us to use matlab functions! The code:

function table=calcAllPercentages(sample)
%get the length of the sample
c=length(sample);
%z is a vector for the relevent sample elements , this operation
%is for getting rid of elements that apper more then once.
z=[];
  for i=1:c
      if length(z)==0
          z=sample(i);
      else
          for j=1:length(z)
              if sample(i)~=z(j) && j==length(z)
                 z(length(z)+1)=sample(i);
              else  sample(i)== z(j);

[Image Analyst]

Are these integers, floating point numbers, or characters or something else?

Answer 1

[Walter Roberson]

http://www.mathworks.co.uk/matlabcentral/answers/38787-what-can-be-programmed-without-any-built-in-functions

Answer 2

[daniel]

Thanks for the help! I got it!