
Re: Creating Adjacency Matrix from a dataset
Posted:
Apr 10, 2013 5:28 AM


"Tehmina" wrote in message <kk33jl$nl2$1@newscl01ah.mathworks.com>... > "Bruno Luong" <b.luong@fogale.findmycountry> wrote in message <kk0n50$639$1@newscl01ah.mathworks.com>... > > A=[0 1 > > 0 2 > > 0 5 > > 1 2 > > 1 3 > > 1 4 > > 2 3 > > 2 5 > > 3 1 > > 3 4 > > 3 5 > > 4 0 > > 4 2 > > 5 2 > > 5 4]; > > > > >> accumarray(A+1,1) > > > > ans = > > > > 0 1 1 0 0 1 > > 0 0 1 1 1 0 > > 0 0 0 1 0 1 > > 0 1 0 0 1 1 > > 1 0 1 0 0 0 > > 0 0 1 0 1 0 > > > > % Bruno > > hi Bruno Luong > thanks for the solution and your time. this solution works well with small example. the actuall size of dataset i am working on is big. it has 1049866 rows in array A. and when i applied your solution to that dataset it gives me following error massege: > > ??? Error using ==> accumarray > Maximum variable size allowed by the program is exceeded. > > now what shud i do? plz help > Thanks >
Create in sparse format:
accumarray(A+1,1,[],[],0,true)
or equivalently use sparse() command
sparse(A(:,1)+1,A(:,2)+1,1)
% Bruno

