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Variable 'ep3' is undefined on some execution paths.

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azadeh jalali
azadeh jalali on 21 Feb 2021
Commented: azadeh jalali on 24 Feb 2021
Hello dears,
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 errors: "Variable 'ep3' is undefined on some execution paths", "Variable 'edotp3' is undefined on some execution paths". However, I define these parameters in the embedded matlab function. In below code I identified the line of error.
function y_3 = fcn3_2star_Edit_01(ys1,ys2)
de3=ys1
e3=ys2
x0nb_up=-0.9; x0z_up=-0.1; x0pb_up=0.9;
x0nb=-1; x0z=0; x0pb=1;
x0nb_bot=-1.1; x0z_bot=0.1; x0pb_bot=1.1;
%% x0z1=0; x0p=1; x0n=-1;
%%%% Mu&SigmaForMF %%%%
muP=1; muZ=0; muN=-1; sigma=0.0598957;
if e3<=x0pb && e3>0
ep3=1*max(0,exp(-(e3-x0pb)^2/0.16))
else
if e3 <=0
ep3=0;
else
if e3 >x0pb
ep3=1*max(0,1)
end
end
end
%%%%%
if e3<=x0z && e3>x0nb
ez3=1*max(0,exp(-(e3-x0z)^2/0.16));
else
if e3>=x0z && e3<x0pb
ez3=1*max(0,exp(-(e3-x0z)^2/0.16));
else
if e3<=x0nb
ez3=0 ;
else
if e3>=x0pb
ez3=0;
end
end
end
end
%%%%%
if e3<x0nb
en3=1*max(0,1);
else
if e3>=x0nb && e3<0
en3=1*max(0,exp(-(e3-x0nb)^2/0.16));
else
if e3>=0
en3=0;
end
end
end
%%%%%%%%%%%%%%%%%%%%
if de3<=x0p && de3>0
edotp3=1*max(0,exp(-(de3-x0p)^2/0.16));
else
if de3 <=0
edotp3=0;
else
if de3>x0p
edotp3=1*max(0,1);
end
end
end
%%%%%
if de3<=x0z && de3>x0nb
edotz3=1*max(0,exp(-(de3-x0z)^2/0.16));
else
if de3>=x0z && de3<x0pb
edotz3=1*max(0,exp(-(de3-x0z)^2/0.16));
else
if de3<=x0nb
edotz3=0 ;
else
if de3>=x0pb
edotz3=0;
end
end
end
end
%%%%%
if de3<x0n
edotn3=1*max(0,1);
else
if de3>=x0n && de3<0
edotn3=1*max(0,exp(-(de3-x0n)^2/0.16));
else
if de3>=0
edotn3=0;
end
end
end
%%%%%%%%%%%%%%
if 0< ep3 && ep3 <1 %%% The ERROR is in this line
p_ep3=(1/((2*sqrt(2*pi))*ep3*sigma))*sqrt(-0.16/(log(ep3)))*(exp(-(sqrt(-0.16*log(ep3))+e3-muP)^2/(2*sigma^2))+exp(-(-sqrt(-0.16*log(ep3))+e3-muP)^2/(2*sigma^2)));
PP_ep3=1-((erf((sqrt(-0.08*log(ep3))+(muP/(2^0.5))-(e3/(2^0.5)))/sigma)+erf((sqrt(2)*sqrt(-0.08*log(ep3))-muP+e3)/(sqrt(2)*sigma)))/(sqrt(2)))
else
p_ep3=0;
PP_ep3 =0;
end
%%%%%%%%%%%%%%
if 0< edotp3 && edotp3 <1 %%% The ERROR is in this line
p_edotp3=(1/((2*sqrt(2*pi))*edotp3*sigma))*sqrt(-0.16/(log(edotp3)))*(exp(-(sqrt(-0.16*log(edotp3))+de3-muP)^2/(2*sigma^2))+exp(-(-sqrt(-0.16*log(edotp3))+de3-muP)^2/(2*sigma^2)));
PP_edotp3=1-((erf((sqrt(-0.08*log(edotp3))+(muP/(2^0.5))-(de3/(2^0.5)))/sigma)+erf((sqrt(2)*sqrt(-0.08*log(edotp3))-muP+de3)/(sqrt(2)*sigma)))/(sqrt(2)))
else
p_edotp3=0;
PP_edotp3=0;
end
%%%%%%
........ the code is continuded
My code is too longe, so I only put the beginig of it up to where there is problem.

Accepted Answer

Jan
Jan on 21 Feb 2021
Edited: Jan on 21 Feb 2021
The message "undefined on some execution paths" means, that there is a possible combination of IF-branches, in which the variable is not defined anywhere. The solution is to create a default value before the IF branchs. This oul simplify your code massively in addition.
Replace:
if e3<=x0pb && e3>0
ep3=1*max(0,exp(-(e3-x0pb)^2/0.16))
else
if e3 <=0
ep3=0;
else
if e3 >x0pb
ep3=1*max(0,1)
end
end
end
by
ep3 = 0;
if e3 <= x0pb && e3 > 0
ep3 = 1 * max(0, exp(-(e3 - x0pb)^2 / 0.16)); % "1*" ?!?
elseif e3 > x0pb
ep3 = 1; % "1*max(0,1)" ?!?
end
The other parts can be simplified also in an equivalent way. E.g.:
if de3<=x0z && de3>x0nb
edotz3=1*max(0,exp(-(de3-x0z)^2/0.16));
else
if de3>=x0z && de3<x0pb
edotz3=1*max(0,exp(-(de3-x0z)^2/0.16));
else
if de3<=x0nb
edotz3=0 ;
else
if de3>=x0pb
edotz3=0;
end
end
end
end
can be simpified to:
edotz3 = 0;
if (de3 <= x0z && de3 > x0nb) || ...
de3 >= x0z && de3 < x0pb)
edotz3 = exp(-(de3 - x0z)^2 / 0.16);
end
Note: max(0, exp(x)) is the same as exp(x), because the result is >= 0 in every case.

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