clear all
j=input('Enter the value of "N": ');
if ischar(i)==1%Exception handling for char input
    fprintf('Please enter an integer value')
break;
end
hold on
for m=1:j
    cla
       axis([-4 4 -1 1])
       axis equal
line([-4 4], [0 0],'Color', 'k')
line([0 0], [-4 4],'Color', 'k')
a=line([0 pi], [1 1],'Color', 'b','LineWidth',2);
line([0 -pi], [-1 -1],'Color', 'b','LineWidth',2)
for i=-3:-1
    text(i,-0.25,int2str(i))
    text(0.2,i,int2str(i))
end
for i=1:3
    text(i+0.05,-0.25,int2str(i))
    text(-0.2,i,int2str(i))
end
for i=-3:-1
    text(-0.05,i,'--')
    text(i,0,'|','FontSize',6)
end
for i=1:3
    text(-0.05,i,'--')
    text(i,0,'|','FontSize',6)
end 
       x=-pi:0.05:pi;
       f2=0;
       xx=-pi:0.05:pi;
            for n=1:m 
                f1=4*(sin((2*n-1)*x)/(2*n-1))/pi;
                f2=f2+f1;
            end
                yy=spline(x,f2,xx);
                p=plot(x,f2,xx,yy,'r','LineWidth',2);
                title(['At N=',int2str(m)])
                ylabel('f(x)')
                set(gca,'XTick',-pi:pi/2:pi)
                set(gca,'XTickLabel',{'-pi','-pi/2','0','pi/2','pi'})
                if m<j
                xlabel({'-pi<x<pi';'Press any key for the next output'})
                end
                if m==j
                xlabel({'-pi<x<pi';'Final o/p'})
                end
       
        pause(1/10);
end