Finite difference scheme used in 'CURL' function?

Which finite difference scheme does Matlab use while estimating vorticity using the CURL function?

Answer 1

[Sindar]

You can actually see the full code using

edit curl

it looks like everything is based on gradient, which appears to use a 2-point difference.

(In fact, all the code for gradient is there too. So, you could set up alternate FD schemes. I'd suggest copying the code into something like gradient_4point, curl_4point)

[Puja Jawahar]

Thanks a lot.