% Chapter 7 Figure mfile:%           Mfile to draw figures on equiripplr amplitude response,%                 error function, and weighted error function.% a) equiripple amplitude responsefigure(1); subplot(1,1,1)f = [0,0.3,0.5,1]; m = [1,1,0,0]; weights = [0.5,1];h = remez(10,f,m,weights);M = length(h); n = 0:M-1;[Hr,w,a,L] = Hr_Type1(h);plot(w/pi,Hr);axis([0,1,-0.15,1.15])xlabel('frequency in pi units');title('Amplitude Response of an Equiripple Filter');hold onwp = w(1:151); ws = w(251:501);upb=Hr(1)*ones(length(wp),1);lpb=(2-Hr(1))*ones(length(wp),1);ipb=ones(length(wp),1);plot(wp/pi,upb,'r',wp/pi,ipb,'g',wp/pi,lpb,'r')usb=Hr(251)*ones(length(ws),1);isb=zeros(length(ws),1);lsb=-Hr(251)*ones(length(ws),1);plot(ws/pi,usb,'r',ws/pi,isb,'g',ws/pi,lsb,'r');set(gca,'XTickMode','manual','XTick',[0,0.3,0.5,1])set(gca,'XTickLabelMode','manual','XTickLabels',[' 0 ';'0.3';'0.5';' 1 '])set(gca,'XGrid','on')set(gca,'YTickMode','manual','YTick',[-0.05,0,0.05,0.90,1,1.10])set(gca,'YTickLabelMode','manual',...        'YTickLabels',['-0.05';' 0.0 ';' 0.05';' 0.90';' 1.0 ';' 1.10'])text(0.31,1,'Ideal Response');text(0.32,0.0,'Ideal Response')hold offprint -deps2 equir_ar.eps%% Error function plotsfigure(2); clg: subplot(2,1,2); erpb=Hr(1:151)-ipb; ersb=Hr(251:501)-isb;plot(wp/pi,erpb,ws/pi,ersb); axis([0,1,-.15,.15]);xlabel('frequency in pi units');title('Error Function');hold onplot(wp/pi,upb-ipb,'r',wp/pi,lpb-ipb,'r')plot(ws/pi,usb-isb,'r',ws/pi,lsb-isb,'r');set(gca,'XTickMode','manual','XTick',[0,0.3,0.5,1])set(gca,'XTickLabelMode','manual','XTickLabels',[' 0 ';'0.3';'0.5';' 1 '])set(gca,'XGrid','on')set(gca,'YTickMode','manual','YTick',[-0.1,-0.05,0,0.05,0.1])set(gca,'YTickLabelMode','manual',...        'YTickLabels',['-0.10';'-0.05';' 0.0 ';' 0.05';' 0.10'])%plot([0,0.5],[-0.05,-0.05],'-.')hold offprint -deps2 errorfun.eps%% Weighted function plotsfigure(3); clg: subplot(2,1,2); werpb = weights(1)*erpb; wersb = weights(2)*ersb;plot(wp/pi,werpb,ws/pi,wersb); axis([0,1,-.1,.1]);xlabel('frequency in pi units');title('Weighted Error Function');hold onplot(wp/pi,weights(1)*(upb-ipb),'r',wp/pi,weights(1)*(lpb-ipb),'r')plot(ws/pi,weights(2)*(usb-isb),'r',ws/pi,weights(2)*(lsb-isb),'r');set(gca,'XTickMode','manual','XTick',[0,0.3,0.5,1])set(gca,'XTickLabelMode','manual','XTickLabels',[' 0 ';'0.3';'0.5';' 1 '])set(gca,'XGrid','on')set(gca,'YTickMode','manual','YTick',[-0.05,0,0.05])set(gca,'YTickLabelMode','manual',...        'YTickLabels',['-0.05';' 0.0 ';' 0.05'])text(0.08,0.075,'weight = 0.5')text(0.70,0.075,'weight = 1.0')hold offprint -deps2 wterrfn.eps