how to make given plot smooth

Hello every one!! I am getting a vector named final_integrand for which code is not shown here.final_integrand is a vector,and I need to plot it on x-axis with y-axis as given below.I am getting the plot but it's not smooth.I want to get a smooth plot.Ploting code is given below.Can any body please help !! Thank You

figure(k)
yy=0:5:5*(length(final_integrand)-1);
plot(final_integrand,yy,'r-','LineWidth',2)
title(sprintf('velocity profile for Step No  %d',k))
xlabel('velocity in mm/sec','FontSize',10,'FontWeight','bold');
ylabel('y(mm)','FontSize',10,'FontWeight','bold');

Answer 1

[VBBV]

Change the step size of vector yy

yy=0:0.2:5*(length(final_integrand)-1);

But ensure that final_integrand is also the same size of vector yy for plottinhg.

It means you have to calculate the integral values for the function having the same size as newly defined vector yy

[Najam us Saqib Fraz]

i cannot change the size of final_integrand......