Error graphing a VVF

I am trying to graph this VVF but it saying "Expected input to be one of these types: function_handle, sym Instead its type was double." What am I doing wrong?

syms t
x = (exp(-t))*sin(t)
y = (exp(-t))*cos(t)
z = 1
fplot3(x, y, z, [0, pi])

[Cassandra Meyer]

This is what I'm graphing.

Answer 1

[Star Strider]

The ‘z’ function needs to be defined as symbolic. Without that provision, fplot3 sees it as a double, not a symbolic constant (which is what you want it to see).

Add that ...

syms t
x = (exp(-t))*sin(t)

x = 

y = (exp(-t))*cos(t)

y = 

z = sym(1)

z = 

1

fplot3(x, y, z, [0, pi])

... to get what I assume is the desired result.

.

[Cassandra Meyer]

Yes, this is perfect. Thank you so much!

[Star Strider]

As always, my pleasure!