Variable 'a' is undefined on some execution paths. Why?
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I'm using the block named Embedded MATLAB (that link the simulink to matlab) and when I try to run the code above, return the message error: "Variable 'a' is undefined on some execution paths". Besides that, other message appears: "Parsing successful for machine: "teste1_05mar13"(#17)" What does it mean?
function y = fcn(ia,va,t)
%#eml
p = ia*va;
N=1000;
if t <= 1.0e-6
a = 0;
b = 0;
end
b = a-0.01; %"b" is the value of the same "a", but is a value that precedes in 0.01 the value "a"
a = b + (p -b)/N;
y=a;
Thanks
1 个评论
Caroline Rosa
2013-3-8
编辑：Azzi Abdelmalek
2013-3-8
采纳的回答
Azzi Abdelmalek
2013-3-8
编辑：Azzi Abdelmalek
2013-3-8
2 个投票
when if t <= 1.0e-6 is false a and b are unknown
3 个评论
Azzi Abdelmalek
2013-3-8
编辑：Azzi Abdelmalek
2013-3-8
function y = fcn(ia,va,t)
persistent a b;
if isempty(a) % Initialization
a=0;
b=0;
end
p = ia*va;
N=1000;
if t <= 1.0e-6 a = 0;
b = 0;
end
b = a-0.01;
a = b + (p -b)/N;
y=a;
Caroline Rosa
2013-3-14
Alejandro Zavala
2017-9-15
Hi I want to run this code about MPPT
%%%%
function D=inc(V,I)
Dinit=.574;
deltaD=0.001;
persistent Va Da Ia;
if isempty(Da)
Va=42.64;
Ia=2;
Da=Dinit;
end
dV=V-Va;
dI=I-Ia;
if dV== 0
if dI~=0
else
if dI>0
D=Da-deltaD;
else
D=Da+deltaD;
end
end
else
if dI/dV==-I/V
else
if dI/dV>-I/V
D=Da-deltaD;
else
D=Da+deltaD;
end
end
end
Da=D;
Va=V;
Ia=I;
but Matlab shows this error
Variable 'D' is not fully defined on some execution paths.
更多回答（1 个）
Ryad BOUKHARI
2017-4-25
0 个投票
Hello,
I faced the same problem, and it works.
Thank you Abdelmalek.
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