Variable 'a' is undefined on some execution paths. Why?

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Caroline Rosa
Caroline Rosa 2013-3-8
评论： Alejandro Zavala 2017-9-15
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
Caroline Rosa 2013-3-8
编辑：Azzi Abdelmalek 2013-3-8
function y = fcn(ia,va,t)
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;
In order to understand better. thanks

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采纳的回答

Azzi Abdelmalek
Azzi Abdelmalek 2013-3-8
编辑：Azzi Abdelmalek 2013-3-8
when if t <= 1.0e-6 is false a and b are unknown
You should declare a and b persistent
  3 个评论
显示 1更早的评论
Caroline Rosa
Caroline Rosa 2013-3-14
thanks for your help Azzi. now it works. Thanks so much
Alejandro Zavala
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.

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更多回答（1 个）

Ryad BOUKHARI
Ryad BOUKHARI 2017-4-25
Hello,
I faced the same problem, and it works.
Thank you Abdelmalek.

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