function X=datagen(Nvec,mean_var)% 2D 啊快矯救 盒器 單撈磐 積己% Nvec: (1xclass) c俺狼 啊快矯救 盒器狼 阿阿俊 措茄 單撈磐 骯薦% mean_var: (3 x class): 阿 努貳膠俊 措竅咯 貿瀾 2 青籃 mean 唱贛瘤 1 青籃 variance[m,c]=size(mean_var);if m ~= 3 | c ~=length(Nvec),   disp(' dimension not match, break ')   breakendX=[];for i=1:c,      randn('seed',sum(100*clock));   tmp=sqrt(mean_var(3,i))*randn(Nvec(i),2); % scaled by variance   mean=mean_var(1:2,i);  % mean is a 2 by 1 vector   X=[X;tmp+ones(Nvec(i),2)*diag(mean)];end