Variable Not fully defined on some execution path error

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I have some code that is inside a simulink block that gets an error when it's compiled. It says a variable is not fully defined on some execution paths, but it's not true.
Here's a simplified version of the code:
function myfunc(logicA, logicB)
A = logicA;
B = logicB; % also input from the function
if A
X = 1;
elseif B
X = 2;
end
if (A || B)
Y = X;
end
It complies fine if I change it to
function myfunc(logicA, logicB)
A = logicA;
B = logicB; % also input from the function
X=2
if A
X = 1;
end
if (A || B)
Y = X;
end
It looks like the compiler doesn't realize that it doesn't need X if (A || B) is false?

Accepted Answer

Walter Roberson
Walter Roberson on 11 Mar 2021
disp(myfunc(1,1))
1
disp(myfunc(1,0))
1
disp(myfunc(0,1))
2
disp(myfunc(0,0))
Output argument "Y" (and maybe others) not assigned during call to "solution>myfunc".
function Y = myfunc(logicA, logicB)
A = logicA;
B = logicB; % also input from the function
if A
X = 1;
elseif B
X = 2;
end
if (A || B)
Y = X;
end
end

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