How to adjust a vector using an if function

Hello every body, below you can find my code. I want to customize the vector A, so if one condition is true the vector A should be adjusted.So a 1 should be added if C is smaller than 0 and a 1 should be subtracted if C is greater than 0. For example: A=[0,0,0,2,2,2,2,....]. But every time my vector A stays the same, only containing 1. Thanks

A= ones(100,1);
B=2*rand(100,1);
C=A-B;
for k=1:length(A);
      if C(k)<0
      A(k)+1;
          else if C(k)>0
          A(k)-1;
          else A(k)   
          end
      end
  end

Answer 1

[KALYAN ACHARJYA]

A=[1 2 -4 0 -10 11] %This is just a example
for k=1:length(A);
      if A(k)<0
         A(k)=A(k)+1;
      elseif A(k)>0
        A(k)=A(k)-1;
      else
        A(k)=A(k)   
      end
end
disp(A);

[KALYAN ACHARJYA]

[KALYAN ACHARJYA]

You have asked for using if else, that what Here use the if else condition, other wise same can be done using indexing also.

[Benedikt Wessel]

Thank you very much!

[KALYAN ACHARJYA]

My Pleasure @Benedikt