How to vectorize this function?

I have the following function:

x3=@(phi) (R-((3-2.*sin(phi))/(1-0.5.*sin(phi)).*R)/4).*cos(phi)

I read some articles saying I have to use elementwise operations but I still get a warning.

Thanks in advance!

Answer 1

[Alan Stevens]

You need a ./ (i.e. dot /)

x3=@(phi) (R-((3-2.*sin(phi))./(1-0.5.*sin(phi)).*R)/4).*cos(phi)

^

[MrBanana]

I tried this earlier but it didn't help either

Warning: Function behaves unexpectedly on array inputs. To improve performance, properly vectorize your function to return an output with the same size
and shape as the input arguments. 
> In matlab.graphics.function.ParameterizedFunctionSurface>checkVectorization
In matlab.graphics.function.ParameterizedFunctionSurface.set.ZFunction
In matlab.graphics.function.ParameterizedFunctionSurface
In fsurf>singleFsurf (line 269)