You are an expert in writing code in many different languages. Your goal is to perform code completion for the following code, keeping in mind the rest of the code and the file meta data.
    Metadata details:
    filename: randnfun.m
    path of file: ./repos/chebfun
    
    the code of the file until where you have to start completion: function f = randnfun(varargin)
%RANDNFUN   Smooth random function
%   F = RANDNFUN(LAMBDA) returns a CHEBFUN on [-1,1] with maximum
%   frequency <= 2pi/LAMBDA and standard normal distribution N(0,1)
%   at each point.  F can be regarded as a sample path of a Gaussian
%   proce
    
function values from N(0,1)
    end
    f = chebfun(c, dom, 'trig', 'coeffs');

else       % nonperiodic case: call periodic case and restrict

    dx = max(0.2,2*lambda/diff(dom));
    dom2 = dom(1) + [0 (1+dx)*diff(dom)];
    m = round(diff(dom)/lambda);

    if lambda == inf
        c = randn;
        if cmplx
            c = (c + 1i*randn)/sqrt(2);
        end