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What is the error in my function? Error: Variable 'T' is not fully defined on some execution paths.

Asked by Meghdeep Jana on 25 May 2017
Latest activity Commented on by Alejandro Zavala on 15 Sep 2017
This is the code which I wrote for generating a Trapezoid curve for BLDC motor. It is showing the following error: 'Variable 'T' is not fully defined on some execution paths'. The code:
% code
function y = fcn(u)
%#codegen
Q = mod(u,2*pi);
if Q >=0 && Q<2*pi/3
T = 1;
elseif Q>= 2*pi/3 && Q< pi
T = 1-6*(Q-2*pi/3)/pi;
elseif Q>= pi && Q<5*pi/3
T = -1;
elseif Q>= 5*pi/3 && Q<2*pi
T = -1 + 6*(Q-5*pi/3)/pi;
end
y=T;

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1 Answer

Answer by Walter Roberson
on 25 May 2017
Edited by Stephen Cobeldick on 25 May 2017
 Accepted Answer

None of the branches is encountered if u is infinite or nan.
function y = fcn(u)
%#codegen
Q = mod(u,2*pi);
if Q<2*pi/3
T = 1;
elseif Q < pi
T = 1-6*(Q-2*pi/3)/pi;
elseif Q < 5*pi/3
T = -1;
elseif Q < 2*pi
T = -1 + 6*(Q-5*pi/3)/pi;
else
T = nan; %if data was inf or nan
end
y=T;

  6 Comments

I want to run this code
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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