piecewise continuous function in SImulink

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Mikhail Fedkin
Mikhail Fedkin 2020-11-7
评论： Ameer Hamza 2020-11-7
Hello!
I made a piecewise functions in Simulink:
function y = fcn(t)
y = piecewise(t < -1,-1, -1<t<1,0, t > 1,1);
pretty simple, but I got problem with output value of function.
"Simulink cannot determine sizes and/or types of the outputs for block "
How to deal with this problem?

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Ameer Hamza
Ameer Hamza 2020-11-7
piecewise is from symbolic toolbox. It will not work in Simulink. Use if-else block
function y = fcn(t)
if t < -1
y = -1;
elseif t < 1
y = 0;
else
y = 1;
end
  2 个评论
Mikhail Fedkin
Mikhail Fedkin 2020-11-7
this was my original function, but this one neither didn't work
function y = sign_with_deadzone (t,delay)
if(t > delay)
if(t > 0)
y = 1;
end
if(t < 0)
y = -1;
end
else
y = 0;
end
anyway thank you)
Ameer Hamza
Ameer Hamza 2020-11-7
Is 't' the simulation time? If yes, then it will never be negative and t < 0 will never become true.

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