MATLAB: How to plot smooth graph

Hi, I was stuck here.. can someone help me out? How do I make the Pbat1 and Pbat2 smooth?
   P_load = [0,8000,10000,11000,20000,25000,25000,21000,30000,20000,12000,45000,12000,45000,23300,12000,15000,17000,20000,16000,12200,1000,2000,100];% Watts


plot(P_load,'linewidth', 2)
P_gen = ones(1,24).*29000; % Watts
P_lowerlimit = ones(1,24).*10000; % Watts
hold on 
plot(P_gen, 'linewidth', 2)
plot(P_lowerlimit, 'linewidth', 2)
grid
xlim([1,24])
xlabel('Time (hours)')
ylabel('Power (Watts)')
hold on
Pnet1 = [];
Pbat1 = [];
Pnet2 = [];
Pbat2 = [];
for h = 1:24
    Pnet1(h) = P_gen(h) - P_load(h);
    Pnet2(h) = P_lowerlimit(h) - P_load(h);
    if Pnet1(h) > 0
        Pbat1(h) = 0;
    else
        Pbat1(h) = P_load(h) - P_gen(h);
    end 
    if Pnet2(h) < 0
        Pbat2(h) = 0;
    else
        Pbat2(h) = [P_gen(h) - P_load(h)]/3;
    end
end
plot(Pbat1, 'linewidth', 3)
plot(Pbat2, 'linewidth', 3)
legend('Load','Generator','Lower limit','Battery energy(Discharge)','Battery energy(Charge)')
If possible, i need with spline code. Help appreciated, thank you.

Best Answer

P_load = [0,8000,10000,11000,20000,25000,25000,21000,30000,20000,12000,45000,12000,45000,23300,12000,15000,17000,20000,16000,12200,1000,2000,100];% Watts


x=1:numel(P_load)
 xx=linspace(1,numel(x),1000)
   yy=interp1(x,P_load,xx,'pchip')
   plot(x,P_load,'*g',xx,yy,'-k','linewidth', 2)
   P_gen = ones(1,24).*29000; % Watts
P_lowerlimit = ones(1,24).*10000; % Watts
hold on 
 xx=linspace(1,numel(x),1000)
   yy=interp1(x,P_gen,xx,'spline')
   plot(x,P_gen,'og',xx,yy,'-m','linewidth', 2)
   xx=linspace(1,numel(x),1000)
   yy=interp1(x,P_lowerlimit,xx,'spline')
   plot(x,P_lowerlimit,'or',xx,yy,'-b','linewidth', 2)
grid
xlim([1,24])
xlabel('Time (hours)')
ylabel('Power (Watts)')
hold on
Pnet1 = [];
Pbat1 = [];
Pnet2 = [];
Pbat2 = [];
for h = 1:24
    Pnet1(h) = P_gen(h) - P_load(h);
    Pnet2(h) = P_lowerlimit(h) - P_load(h);
    if Pnet1(h) > 0
        Pbat1(h) = 0;
    else
        Pbat1(h) = P_load(h) - P_gen(h);
    end 
    if Pnet2(h) < 0
        Pbat2(h) = 0;
    else
        Pbat2(h) = [P_gen(h) - P_load(h)]/3;
    end
end
xx=linspace(1,numel(x),1000)
   yy=interp1(x,Pbat1,xx,'spline')
   plot(x,Pbat1,'ok',xx,yy,'-y','linewidth', 3)
   xx=linspace(1,numel(x),1000)
   yy=interp1(x,Pbat2,xx,'spline')
   plot(x,Pbat2,'oc',xx,yy,'-r','linewidth', 3)
   legend('Load','Generator','Lower limit','Battery energy(Discharge)','Battery energy(Charge)')
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