Text3D Invalid use of operator

Hi,

I'm pretty new to Matlab so I'm not very familiar with the syntax. I want to plot an Arrow with Text annotated in 3D, so I thought Text3D would be a good option. I red the documentation on https://www.mathworks.com/help/symbolic/mupad_ref/textorientation.html

If I just create a new script and copy for example, "Example 1"

p1 := plot::Point3d([1, 2, 3], PointSize = 3*unit::mm):
text1 := plot::Text3d("Hello world!", [1, 2, 3], 
             TextOrientation = [cos(a), sin(a), 0, 0, 0, 1],
             a = 0..2*PI, TextFont = [24],
             Billboarding = FALSE):
p2 := plot::Point3d([3, 6, 9], PointSize = 3*unit::mm):
text2 := plot::Text3d("MuPAD", [3, 6, 9], 
             TextOrientation = [1, 0, 0, 0, sin(a), cos(a)],
             a = 0..2*PI, TextFont = [24],
             Billboarding = FALSE):
plot(p1, text1, p2, text2)

I get a "Invalid use of operator" error. Aren't the examples working stand alone code? How can I make it work?

[KSSV]

 X = rand(2,1) ; 
 Y = rand(2,1) ; 
 annotation('arrow',X,Y);

Answer 1

[Steven Lord]

This function cannot be used directly in a MATLAB script, function, or class. It can only be used in a MuPAD Notebook or by evaluating it in a MuPAD symengine.

Instead, use annotation with the 'arrow' or 'textarrow' annotation type as KSSV suggested.

[Sebastian Thoma]

Is there any way to get some sort of perspective text orientation in MATLAB scripts as Text3D and Billboarding do?