rnormal()={
	my(u1=random(1.),u2=random(1.));
	sqrt(-2*log(u1))*cos(2*Pi*u2)
	\\ Could easily be extended with a second normal at very little cost.
};
mean(v)={
  sum(i=1,#v,v[i])/#v
};
stdev(v,mu="")={
  if(mu=="",mu=mean(v));
  sqrt(sum(i=1,#v,(v[i]-mu)^2))/#v
};
histogram(v,bins=16,low=0,high=1)={
  my(u=vector(bins),width=(high-low)/bins);
  for(i=1,#v,u[(v[i]-low)\width+1]++);
  u
};
show(n)={
  my(v=vector(n,i,rnormal()),m=mean(v),s=stdev(v,m),h,sz=ceil(n/300));
  h=histogram(v,,vecmin(v)-.1,vecmax(v)+.1);
  for(i=1,#h,for(j=1,h[i]\sz,print1("#"));print());
};
show(10^4)