Convolving two piecewise functions

Is it possible to convolve using piecewise function like below ? I get error and don't know how to fix it

clc
clear
syms t
x=piecewise(-2<=t<1,2*(t+2).^2,1<=t<3,18,3<=t<5,-9*(t-5),0);
h=piecewise(0<=t<2,3*t,2<=t<4,-6*(t-3),0);
fplot(x)
hold on
fplot(h)
hold on
y(t)=conv(x,h,'same')
fplot(y)
grid

Answer 1

[Walter Roberson]

No. conv() is only for discrete values. To do convolution with functions use int()

[Paul]

Does conv work at all with sym objects?

[Walter Roberson]

Error using conv2 Invalid data type. First and second arguments must be numeric or logical.

Error in conv (line 43) c = conv2(a(:),b(:),shape);