Error defining a discontinous function: "Output argument "y2" (and possibly others) not assigned a value in the execution with "x2" function

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Tomás Rodríguez Yagui
评论： Tomás Rodríguez Yagui 2022-4-6
I tried defining a function, x2(t), such that:
As such, I implemented in in MatLab as follows:
function y2 = x2(t)
if 0 <= t & t < 0.2 % First condition, 0 <= t < 0.2
y2 = 3;
elseif 0.2 <= t & t < 0.4 % Second condition, 0.2 <= t < 0.4
y2 = 1.5;
elseif 0.4 <= t & t < 0.7 % Third condition, 0.4 <= t < 0.7
y2 = -1.5;
elseif 0.7 <= t & t < 1 % Fourth condition, 0.7 <= t < 1
y2 = -3;
end
end
However, I wasn't able to run the following code:
t = 0:1/20000*pi:1;
a = x2(t);
As I got the following error message: Output argument "y2" (and possibly others) not assigned a value in the execution with "x2" function.
What exactly is causing the error and how should I implement this differently so that the function works?

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采纳的回答

MJFcoNaN
MJFcoNaN 2022-4-6
Your function does not consider a vector as input.
Use for loop, such as:
a=NaN(length(t));
for ii = 1:length(t)
a(ii)=x2(t(ii));
end
or more efficiently modify your function by vectorization.

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