% Chapter 7 Matlab Figure on %           sym impulse response odd M%subplot(1,1,1)% ODD Mh = [-4,1,-1,-2,5,6,5,-2,-1,1,-4];M = length(h); n = 0:M-1; alpha = (M-1)/2;subplot(2,1,2);stem(n,h); axis([-1,M,-5,8]);title('Symmetric Impulse Response: M odd')xlabel('n'); ylabel('h(n)')set(gca,'XTickMode','manual','XTick',[0,5,10],'Xgrid','on')set(gca,'XTickLabelMode','manual',...        'XTickLabels',['   0   ';'(M-1)/2';' (M-1) '])set(gca,'YTickMode','manual','YTick',[0],'Ygrid','off')set(gca,'YTickLabelMode','manual','YTickLabels',['0'])