How to label smooth spline graph?

I have a new problem now on how to label them. by using legend code, seems it be different between points and line.. i use spline code. see the picture:

and here is my code:

   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,'spline')
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,'--r',xx,yy,'--r')
xx=linspace(1,numel(x),1000)
yy=interp1(x,P_lowerlimit,xx,'spline')
plot(x,P_lowerlimit,'--m',xx,yy,'--m')
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,'-c',xx,yy,'-c','linewidth', 3)
xx = linspace(1,numel(x),1000)
yy = interp1(x,Pbat2,xx,'spline')
plot(x,Pbat2,xx,yy,'-b','linewidth', 3)
legend('Load','Generator','Lower limit','Battery energy(Discharge)','Battery energy(Charge)')

How to make them be one? as they need to be one. Thanks :D

Answer 1

[madhan ravi]

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(xx,yy,'-*g')
   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(xx,yy,'-og','linewidth', 2)
   xx=linspace(1,numel(x),1000)
   yy=interp1(x,P_lowerlimit,xx,'spline')
   plot(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(xx,yy,'-y','linewidth', 3)
   xx=linspace(1,numel(x),1000)
   yy=interp1(x,Pbat2,xx,'spline')
   plot(xx,yy,'-r','linewidth', 3)
   legend('Load','Generator','Lower limit','Battery energy(Discharge)','Battery energy(Charge)'

[madhan ravi]

See edited answer now

[madhan ravi]

If something is not clear let know else accept the answer so people know the question is solved

[Ain Athirah]

It solved. I will do some modification, thanks a lot :) u r superb!

[madhan ravi]

Anytime :)