extract the information from a matrix with three columns - matlab

Question

I have a matrix with three columns
https://www.dropbox.com/s/jckdmg1p05v8lv7/y.mat?dl=0
i.e.
E1 E2 W
6 1464 0.36
6 1534 0.27
6 1585 0.27
8 1331 0.332
11 445 0.39
13 844 0.286
14 12 0.126
18 952 0.31
19 2376 0.32
20 394 0.22
20 399 0.22
20 589 0.22
21 321 0.22
21 1187 0.22
21 2509 0.22
22 1187 0.22
23 2235 0.22
24 2376 0.22
25 541 0.14
26 229 0.22
26 321 0.22
26 1187 0.22
26 2054 0.22
27 394 0.53
27 541 0.31
28 394 0.22
28 781 0.22
I used this condition
for k=1:size(y,1)
G(y(k,1),y(k,2))=true;
G(y(k,2),y(k,1))=true;
end
B=cellfun(#(x1) find(x1),num2cell(G,2),'un',0);
to extract links information like this:
1 394
2 2378
3 282
4 282
5 536
6 [1464,1534,1585]
7 2087
8 [394,399,1331]
9 1187
I need a third column contains the weight
e.i. {6,[1464,1534,1585],[0.36;0.27;0.27]}
I tried to use the above condition but I did not get the right values. Does anyone have idea how to do that ??

Answer 1

this is a possible soultion using accumarray:
a=[...
6 1464 0.36
6 1534 0.27
6 1585 0.27
8 1331 0.332
11 445 0.39
13 844 0.286
14 12 0.126
18 952 0.31
19 2376 0.32
20 394 0.22
20 399 0.22
20 589 0.22
21 321 0.22
21 1187 0.22
21 2509 0.22
22 1187 0.22
23 2235 0.22
24 2376 0.22
25 541 0.14
26 229 0.22
26 321 0.22
26 1187 0.22
26 2054 0.22
27 394 0.53
27 541 0.31
28 394 0.22
28 781 0.22];
% concatenate a with its copy, columns 1 and 2 swapped regarding symmetric relations
a = [a ; [fliplr(a(: , 1:2)) , a(: , 3) ]];
%create proper increasing indices for use in accumarray
[S SI] = sort(a(:,1));
S2=[0; (cumsum(diff(S)>0))];
idx = a(:,1);
idx(SI) = S2+1;
%gather elemets for each category
c1=accumarray([idx],a(:,1),[],#(x) {x(1)});
c2=accumarray([idx],a(:,2),[],#(x) {x});
c3=accumarray([idx],a(:,3),[],#(x) {x});
%concatenate columns
out=([c1 c2 c3]);
% your example
out(1,:)