The function return value 'value' might be unset.

Question

Benjamin Moak 2019-5-8

0
链接

此问题的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/460820-the-function-return-value-value-might-be-unset

回答： Star Strider 2019-5-8

I'm trying to make a code that uses Euler's method into a function that can be called later. This is the original, which works as intended.

K = 167; H = 100; Te = 20; w = 0.01; T(1) = 100;
t = 0.001; L = 0.4; A = w*t; P = 2*w + 2*t;
h = 0.1/100; x = [0:h:0.4];
V = -21277.8;
Tprime = @(V)V;
Vprime = @(T) (H*P*(T-Te))/(K*A);
 
for k = 1:length(x)-1
    T(k+1) = T(k) + h*Tprime(V(k));
    V(k+1) = V(k) + h*Vprime(T(k));
end
TL = T(k)
T(1:5)

And this is my attempt at making it into a function that can be called.

function value = Problem2B(V)
K = 167; H = 100; Te = 20; w = 0.01; T(1) = 100;
t = 0.001; L = 0.4; A = w*t; P = 2*w + 2*t;
h = 0.1/100; x = [0:h:0.4];
V = -21277.8;
Tprime = @(V)V;
Vprime = @(T) (H*P*(T-Te))/(K*A);
 
for k = 1:length(x)-1
    T(k+1) = T(k) + h*Tprime(V(k));
    V(k+1) = V(k) + h*Vprime(T(k));
end
TL = T(k)
T(1:5)
Problem2B = TL
end