function scale() in R doesn't scale the data symmetrically : <p>I apologize if my question is simple. I tried to find the answer but I didn't find much info.</p>

<p>I use the scale() function in R to scale my data. What I don't understand is that when I plot my scaled data using matplot() it seems my scaled data aren't symmetric. which means the range of the sacled data is <code>-1,-0.5,0,0.5,1,1.5</code>. As I know, we scale the data to mean zero and standard deviation s. So my data should have a deviation of s from mean but here I have a deviation of 1.5 and a deviation of -1. Why?</p>
