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Trouble using ezplot and matlabFunction on a symbolic function defined using symengine "piecewise"

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syms x t;
MP_syntax1 = 'piecewise([x <= 10, x/10], [10 < x <= 30, (30 - x)/20])';
MP_syntax2 = 'ilaplace(2/s^3,s,t)';
f(x) = evalin(symengine,MP_syntax1);
g(t) = evalin(symengine,MP_syntax2);
No trouble with g(t) or other MuPad functions:
ezplot(g(t), [-5,5]);
G = matlabFunction(g(t));
Trying the same to the piecewise, f(x) will not work however.
ezplot(f(x),[0,30]);
F = matlabFunction(f(x));
However, this works
xd = 0:0.1:30;
fd = double(f(xd));
plot(xd,fd);
What is wrong with the other calls using ezplot and matlabFunction for f(x) ?
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Sally Al Khamees
Sally Al Khamees le 23 Déc 2016
Modifié(e) : Sally Al Khamees le 21 Fév 2017
If you have R2016b and the Symbolic Math Toolbox installed, you can just use the piecewise function:
For example:

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