generation of probability matrix

i wanna generate matrix Nx23 , where N=number of users,

each user has 23 columns of random probabilities ,

the objective is to generate matrix Nx23 of random probabilities,

where the sum of probabilities of each row equals one

Answer 1

[Walter Roberson]

https://www.mathworks.com/matlabcentral/fileexchange/9700-random-vectors-with-fixed-sum