MATLAB: ‘Matrix dimensions must agree’ error.

agreedimensionsMATLABmatrixmust

% Hello guys, I am trying to do this problem, but ı get matrix dimensions must agree error. Can you please help me with that?
p=1.225;
p2=[1.225;0.7364;0.4135];
g=9.81;
s=845;
cd0=0.0163;
ar=7.53;
e=0.74;
k=1/(pi*e*ar);
w=540000*g;
clmax=2.6;
 
v_stall=sqrt((2*w)/(p2*s*clmax));
v=v_stall:700;
D0=0.5*p2*v.^2*s*cd0;
Di=(2*k*w^2)./(p2*v.^2*s);
D=D0+Di;
P=D.*v;

Best Answer

p = 1.225;
p2 = [1.225; 0.7364; 0.4135];
num_p2 = length(p2);
g = 9.81;
s = 845;
cd0 = 0.0163;
ar = 7.53;
e = 0.74;
k = 1/(pi*e*ar);
w = 540000*g;
clmax = 2.6;
 
v_stall = sqrt((2*w)./(p2*s*clmax));
v = cell(num_p2, 1);
P = cell(num_p2, 1);
for K = 1 : num_p2
    v{K} = v_stall(K) : 700;
    D0 = 0.5 * p2(K) .* v{K}.^2 .*s .* cd0;
    Di = (2 .* k .* w.^2) ./ (p2(K) .* v{K}.^2*s);
    D = D0 + Di;
    P{K} = D .* v{K};
end
temp = [v,P].';
plot(temp{:});
legend( string(p2) );
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