Using cos function in matrix leads to invalid input character

I have an unexpecetd error when trying to

>> Rz= [cos(0.2) -sin(0.2) 0; sin(0.2) cos(0.2) 0; 0 0 1]
 Rz= [cos(0.2) -sin(0.2) 0; sin(0.2) cos(0.2) 0; 0 0 1]
         ↑
Error: The input character is not valid in MATLAB statements or
expressions.

Answer 1

[James Tursa]

You have special unprintable characters between the "cos" and the "(" characters, and between the "sin" and the "(". You need to delete these. E.g., just copy and paste what you have written above into the MATLAB command line and you will see them as red squares. I am guessing you didn't type this in by hand originally, but copied it from a document or web page and didn't realize those special characters were there.

[Antoine Compagnie]

Thank you for considering my question! However, I copied and past what I have written above into the MatLab command line and I didn't had red squares... Actually I even remindhaving written the whole matrix myself!

[James Tursa]

The characters are definitely there. Try typing it in again from scratch. Or just copy and paste this which has those special characters removed:

Rz= [cos(0.2) -sin(0.2) 0; sin(0.2) cos(0.2) 0; 0 0 1]