Clipping an audio signal

I want to clip an audio signal X like this :

 X(X>=(max(X)-0.5)) = max(X)-0.5;
 X(X<=(min(X)+0.5)) = min(X)+0.5;

But with a for-loop. I've written this:

for k = 1:length(X)
  if X(k)>=(max(X)-0.5)      
      X(k) = max(X)-0.5;
  elseif X(k)<=(min(X)+0.5)
      X(k) = min(X)+0.5;
  end
end

But it does not seem to do the same thing. What am I doing wrong?

Answer 1

[Greg Dionne]

You're clobbering the values in your for-loop. Try defining maxX = max(X) and minX = min(X) before modifying X.