[R] Re : Generate a random bistochastic matrix

[Florent Bresson]

Thanks, I think it's a shrewd solution, but the problem is that it cannot generate every N*N bistochastic matrix and every cell tends to 1/N as B tends to infinity

Florent Bresson

----- Message d'origine ----
De : Dimitris Rizopoulos <dimitris.rizopoulos at med.kuleuven.be>
À : Florent Bresson <f_bresson at yahoo.fr>
Cc : r-help at stat.math.ethz.ch
Envoyé le : Lundi, 16 Octobre 2006, 16h35mn 02s
Objet : Re: [R] Generate a random bistochastic matrix

you can try something like the following:

B <- 10
N <- 5
mats <- r2dtable(B, rep(1, N), rep(1, N))
out <- matrix(0, N, N)
for(i in 1:length(mats))
    out <- out + mats[[i]]
out <- out / B
out
colSums(out)
rowSums(out)



I hope it helps.

Best,
Dimitris

----
Dimitris Rizopoulos
Ph.D. Student
Biostatistical Centre
School of Public Health
Catholic University of Leuven

Address: Kapucijnenvoer 35, Leuven, Belgium
Tel: +32/(0)16/336899
Fax: +32/(0)16/337015
Web: http://med.kuleuven.be/biostat/
     http://www.student.kuleuven.be/~m0390867/dimitris.htm


----- Original Message ----- 
From: "Florent Bresson" <f_bresson at yahoo.fr>
To: <r-help at stat.math.ethz.ch>
Sent: Monday, October 16, 2006 10:22 AM
Subject: [R] Generate a random bistochastic matrix


Please, I would like to generate a random bistochastic matrix, that is 
a squared matrix of non-negative numbers  with  each row and each 
column sum to 1, for example :

.2    .3    .5
.6    .3    .1
.2     .4     .4

I don't know of to code this. Do you have any idea ?

Thanks

Florent Bresson








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