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output argument not assigned during call

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this is part of the code but i get an error that " output argument J not assigned during call" can anyone help me see where im messing up
K = linspace(-20.5,13,501);
UpperBound = 1;
LowerBound = 0;
J = MYFunction(K)
function J = MYFunction(x)
N = length(x);
for n = 1:N
if x(n) <= -5.5
y(n) = .2.*x(n) + 4.1;
end
if (x(n) > -5.5 & x(n) <= 5.5)
y(n) = .08.*x(n).^2 + 5.42;
end
if x(n) > 5.5
y(n) = -.4.*x(n) + 5.2;
end
end

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Accepted Answer

Image Analyst
Image Analyst on 30 Jun 2020
Probably your y is supposed to be your J
K = linspace(-20.5,13,501);
UpperBound = 1;
LowerBound = 0;
J = MYFunction(K)
function J = MYFunction(x)
J = x; % Initialize.
y = x;
N = length(x);
for n = 1:N
if x(n) <= -5.5
y(n) = .2.*x(n) + 4.1;
end
if (x(n) > -5.5 & x(n) <= 5.5)
y(n) = .08.*x(n).^2 + 5.42;
end
if x(n) > 5.5
y(n) = -.4.*x(n) + 5.2;
end
end
% Assign output y ==> J
J = y;
Not sure why you create UpperBound and LowerBound -- they aren't used anywhere.

  1 Comment

Robert Tapia
Robert Tapia on 30 Jun 2020
oh the upperbound/lowerbound are used for a while loop i just didnt include it since i dont think it mattered for the error i was getting

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More Answers (1)

Steven Lord
Steven Lord on 30 Jun 2020
Where in your MYFunction function do you assign any value to the variable J?

  2 Comments

Robert Tapia
Robert Tapia on 30 Jun 2020
we weren't given any values to assign to J, professor just has " define: J = MYFunction(K)" and to calculate the values for it
Prateek Tiwari
Prateek Tiwari on 30 Jun 2020
Hi @ Steven
Can you please help me with this,
https://nl.mathworks.com/matlabcentral/answers/557005-calling-a-function-in-matlab-function-block-in-simulink?s_tid=prof_contriblnk

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