How can I create a new matrix with x and y coordinates using a for loop?

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Sebastian
Sebastian 2014-1-18
编辑： Paul 2014-1-18
Lets say I have a matrix A like this:
A=
0 0 1 0 0 0
0 0 0 0 1 0
0 1 0 0 0 1
I want to create a for loop in which this loop creates a new matrix like this
B=
1 3 1
2 5 2
3 2 3
4 6 3
The first column will be the ones showed in the matrix A(point 1,2,3,4) and the second and third columns will be the x and y coordinates of those points(point 1 is at 3 in the x direction and 1 in the y direction). Is it possible?

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Paul
Paul 2014-1-18
编辑：Paul 2014-1-18
[y,x]=find(A==1);
num=length(x);
B=[(1:num)',x,y];
If you want to sort the points the way you described do for example this:
[y,x]=find(A==1);
num=length(x);
xy=sortrows([x,y],2)
B=[(1:num)',xy]
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Paul
Paul 2014-1-18
编辑：Paul 2014-1-18
Yes but why, this is easier. You can do it like this:
p=1;
[row,col] = size(A);
for i = 1:row
for j=1:col
if(A(i,j)==1)
B(p,:)=[p,j,i];
p=p+1;
end
end
end

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