not getting plot , why?

for h=0:100:1200
    rho = 1.225*((288-0.0065*h)/288)^4.2561;   
    sigma=0.047193;
    V_tip=180;
    W=180;
    Cd_avg=0.01;
    R=2.235;
    k=1.1;
    A=pi*R.^2;
P_e= 61147.4;
P_req=k*((W)^(3/2))./sqrt(2.*rho.*A)+(Cd_avg*rho*sigma*A.*(V_tip).^3)./(8) +747.643-(0.3*P_e);
V_c=(P_e-P_req)./W;
hold on
plot(V_c,h,'r--');
xlabel("vc");
ylabel("h");
plot(P_req,h,'b')
end

Answer 1

[Alan Stevens]

Arrange it like this

sigma=0.047193;
V_tip=180;
W=180;
Cd_avg=0.01;
R=2.235;
k=1.1;
A=pi*R.^2;
P_e= 61147.4;

h=0:100:1200;

for i = 1:numel(h)
rho = 1.225*((288-0.0065*h(i))/288)^4.2561;   
P_req(i)=k*((W)^(3/2))./sqrt(2.*rho.*A)+(Cd_avg*rho*sigma*A.*(V_tip).^3)./(8) +747.643-(0.3*P_e);
V_c(i)=(P_e-P_req(i))./W;
end

subplot(2,1,1)
plot(V_c,h,'r--');
xlabel("vc");
ylabel("h");
subplot(2,1,2)
plot(P_req,h,'b')
xlabel("preq");
ylabel("h");

[Sourav singh]

i want to plot the four values in a single graph like

plot(V_c,h,P_req,h)

how can i do this ??

[Alan Stevens]

Change

subplot(2,1,1)
plot(V_c,h,'r--');
xlabel("vc");
ylabel("h");
subplot(2,1,2)
plot(P_req,h,'b')
xlabel("preq");
ylabel("h");

to

plot(V_c,h,'r--',P_req,h,'b');
xlabel("vc and preq");
ylabel("h");