# How to split a matrix?

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Moe on 18 Feb 2016
Commented: Moe on 22 Feb 2016
Hello everyone,
I have the matrix A as follow:
A = [25,240,15,H;25,255,10,R;25,265,20,H;63,240,10,W;63,250,35,L];
The first column in matrix A is the ID that indicates that which row is belongs to what ID (e.g. the first,second and tird row are belongs to ID = 25 , and, forth and fifth row are belong to ID = 63.)
So, I want matrix B like to follow:
B = [ID 240 245 250 255 260 265 270 275 280
25 H H H R R H H H H
63 W W L L L L L L L];
Each DU is divided by 3 (e.g. 15/3 = 5) and then by each of these 5 is added to the ST (e.g. 240, 245 (=240+5), 250 (=245+5).
Moe on 18 Feb 2016
Characters H, R, W and L can change with any numbers as well. For example, instead of H = 100, R = 101, W = 102, L = 103.

Andrei Bobrov on 19 Feb 2016
Edited: Andrei Bobrov on 21 Feb 2016
[a1,~,c1] = unique(n(:,1));
c3 = (n(:,3)-240)/5+1;
c4 = n(:,end)/5;
n2 = n(:,2);
z = accumarray(c1,c4);
b = cumsum(accumarray([c3,c1],1,[z(1),max(c1)]));
out1 = n2(bsxfun(@plus,b,cumsum([0,b(end,1:end-1)])))';
out = [nan,240+(0:z(1)-1)*5;[a1,out1]]
Moe on 22 Feb 2016
Grear Andrei, Thanks!