# How to create three columns for matrix after indexing

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Mahesh on 18 Feb 2015
Edited: Jos on 18 Feb 2015
Dear all, I have a 8X8X8 three dimensional matrix. I would like to create 512X4 matrix so that first column give the position of x, second column the position of y and third one for z position.
I have a code like this
nx = size(dyzw,1);
ny = size(dyzw,2);
nz = size(dyzw,1);
N = nx*ny*nz;
bigData = dyzw(:);
bigMatrix = zeros(N, 4);
for i = 1: N
bigMatrix(i,4) = bigData(i);
for j = 1: nx
for k = 1: ny
for l = 1:nz
bigMatrix(i,1) =j;
bigMatrix(i,2) =k;
bigMatrix(i,3) =l;
end
end
end
end
But I failed to produce the matrix as I want. Could you please check my code please.
Thanks

Jos on 18 Feb 2015
Edited: Jos on 18 Feb 2015
Hi Mahesh,
this will do what you want
nx = size(dyzw,1);
ny = size(dyzw,2);
nz = size(dyzw,3);
N = nx*ny*nz;
bigMatrix = zeros(N,4);
i = 0;
for j = 1:nx
for k = 1:ny
for l = 1:nz
i = i+1;
bigMatrix(i,1) = j;
bigMatrix(i,2) = k;
bigMatrix(i,3) = l;
bigMatrix(i,4) = dyzw(j,k,l);
end
end
end

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