MATLAB: Interpolation to maximum points

interpolationMATLABwind turbine power coefficient

Hi all, I have below code to generate a group of graphs. I need to interpolate a line through their maximum points. could you please help? in addition I need to cut the graph below the -0.1 if it is possible. Thanks
Cp=[ ];
landa=(0:0.1:16);
for B=0:3:30
    for  i=1:1:length(landa)
        landa_i=1/((1/(landa(i)+0.08*B))-(0.035/(B^3+1)));
        Cpi=0.22*((116/landa_i)-(0.4*B)-5)*exp(-12.5/landa_i);
        Cp=[Cp Cpi];
    end
    if B==0
        Cpmax=max(Cp);
    end
    plot(landa,Cp,'b');
    % mesh(landa,B);
    hold on;
    Cp=[ ];
end
xlabel('Tip speed ratio');
ylabel ('Performance corfficient Cp');
hold off;

Best Answer

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Cp=[ ];
landa=(0:0.1:16);
result=[];
for B=0:3:30
    for  i=1:1:length(landa)
        landa_i=1/((1/(landa(i)+0.08*B))-(0.035/(B^3+1)));
        Cpi=0.22*((116/landa_i)-(0.4*B)-5)*exp(-12.5/landa_i);
        Cp=[Cp Cpi];
    end
    if B==0
        Cpmax=max(Cp);
    end
    result=[result Cp']; 
    plot(landa,Cp,'b');
    % mesh(landa,B);
    hold on;
    Cp=[ ];
end
xlabel('Tip speed ratio');
ylabel ('Performance corfficient Cp');
%hold off;
[i1,j1]=max(result)
xi=landa(j1);yi=i1;
xyi=sortrows([xi' yi'],1)
hold on
 x1=landa(min(j1):max(j1))
 y1=interp1(xyi(:,1),xyi(:,2),x1);
 plot(x1,y1,'r')
 set(gca,'ylim',[-0.1 max(i1)])
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