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: spm_samp_mix.m
    path of file: ./repos/spm/toolbox/mixture
    
    the code of the file until where you have to start completion: function [x,label] = spm_samp_mix (mix, N)
% Sample from a Gaussian Mixture PDF
% FORMAT [x,label] = spm_samp_mix (mix, N)
%
% mix   Data structure for mixture model (see spm_mix for info)
% N     Number of samples
%
% x     [N x d] matrix of samples
% label [N x 1] vector of sample labels
%__________________________________________________________________________

    
function [x,label] = spm_samp_mix (mix, N)
% Sample from a Gaussian Mixture PDF
% FORMAT [x,label] = spm_samp_mix (mix, N)
%
% mix   Data structure for mixture model (see spm_mix for info)
% N     Number of samples
%
% x     [N x d] matrix of samples
% label [N x 1] vector of sample labels
%__________________________________________________________________________

% Will Penny
% Copyright (C) 2007-2022 Wellcome Centre for Human Neuroimaging


priors = rand(1, N);
cum_prior = 0;
total_samples = 0;
label = zeros(N, 1);
for j=1:mix.m
    num_samples = sum(priors >= cum_prior & ...
        priors < cum_prior + mix.state(j).prior);
    m=mix.state(j).m;
    C=squeeze(mix.state(j).C);
    x(total_samples+1:total_samples+num_samples, :) = ...
        spm_samp_gauss(m, C, num_samples);
    cum_prior = cum_prior + mix.state(j).prior;
    total_samples = total_samples + num_samples;
    label(total_samples+1:total_samples+num_samples) = j;
end