On Jun 12, 1:08 pm, Etienne Rousee <etie...@rousee.org> wrote: > Le 12/06/2010 12:05, Javier Montoya a écrit : > > > I need to generate a vector of random float numbers between [0,1] such > > that their sum equals 1 and that are distributed non-uniformly. > > Is there any python function that generates such a vector? > > Let f any function (injective is better). > Let a1,...,an n numbers uniformly distributed. > Let s the sum of f(a1),...,f(an). > > f(a1)/s, ... , f(an)/s is what you want. > > You have to choose f to obtain the distribution you prefer. > > -- > > Etienne
Hi Etienne, Thanks for your suggestion. I ended with following code: N=5 a=np.random.random_integers(2*N, size=(1.,N)) a=a/float(sum(a)) However, in some cases, the random numbers are even repeated, for example, I obtained the following sequence: [0.03846154, 0.03846154, 0.23076923, 0.34615385, 0.34615385] This is mainly because in random_integers the integers generated might be repeated. One solution, would be to set the first parameter in random_integers to a larger number. What do you think? Do you suggest any other function instead of random_integers? Best wishes -- http://mail.python.org/mailman/listinfo/python-list
