If you only want to shift the view of the histogram, simply use
xlim([-1 1])
%and/or
ylim([-1 1])
so show only that part of the histogram that appears between (-1,1). (I'm not sure what axis you meant, so try both :) ).
If you instead meant that you want the data to appear between (-1, 1), you'd actually have to adjust y itself to ensure no values are smaller than -1 or larger than 1, but I doubt that's what you're after.
