'chebfun' in GRF.m

[JianfengNing]

Hello,
when I run the matlab file gen_Burgers, there is an error in the line

uu = chebfun(c, [0 1], 'trig', 'coeffs');

I cannot find the definition of chebfun, so what is this?

[sifanexisted]

Hi,

Chebfun Chebfun is an open-source MATLAB package for solving differential equations using Chebyshev polynomials. Please see https://www.chebfun.org/ for more details.