Why the last row is wrong？

t=sym('t','positive')

ut=str2sym('Heaviside(t)-Heaviside(t-1)')

ht=t*exp(-t)

yt=int(subs(ut,t,tao)*subs(ht,t,t-tao),tao,0,t)

yt=collect(yt,'Heaviside(t-1)')

What can I do to correct the last row?

My product is Matlab R2018

Thanks.

[Jan]

If you mention, that there is an error in the last line, please post the error message. It is useful to provide as much information as possible.

Answer 1

[zhenyu zeng]

Wrong： sym.charToFunction (line 26)

Invalid variable name.

Wrong： sym/collect (line 40)

x = sym.charToFunction(x);