I cant find the error in there. can you help me

Undefined function 'reflect_collusion' for input arguments of type 'double'.

Error in odev (line 37) [x_coords,y_coords,stepsx,stepsy] =reflect_collusion(x_coords,y_coords,stepsx,stepsy,i,k);

Answer 1

[Stephen23]

This might be a spelling mistake, perhaps you meant to write reflect_collision.

Otherwise you will need to make sure that there is a function with that name of your path:

 which reflect_collusion

If there is none found then you either need to write it, or download it, or correct its name, or add its directory to the MATLAB path, or make the function name the same as the file name. MATLAB cannot use functions that it does not know about, so it is up to you to make sure that it knows where to find all functions that it needs to run your code.

[Didem]

I added to path then problem solved, thank you so much.