Huh--I answered this early this AM but it seems to have not "stuck"---
Use the histcounts function with defined edges vector for bins and the plot the results...
edges=linspace(1,160,31); % pick number of bins, points is 1+ that over your range
N = histcounts(X,edges); % get the counts in those bins
x=filter(edges,[0.5 0.5],1); % midpoint of bins; mean of edges
plot(x(2:end),N) % and plot...N.B. start with second x to get number bins wanted
