How do I extract the function from a piecewise defined function in Matlab?

I'm using the new Matlab piecewise function https://www.mathworks.com/help/symbolic/piecewise.html introduced in the Symbolic Math Toolbox R2016b to define a function, and I'm trying to extract the function expression part from the whole piecewise variable. Specifically my code looks something like:

syms x;
y = piecewise(x>1,3*x^2,0);

I'd like to be able to extract just the

3*x^2

from y without the condition.

Any idea how to do that?

[Nicolas Schmit]

Hello. Assume x>1 then simplify the expression.

syms x
y = piecewise(x>1,3*x^2,0);
assume (x>1);
simplify(y)

Answer 1

[Walter Roberson]

You can use children() to extract the subexpressions of a symbolic expression.