How to organize an array (x_i,y_j,z) such that (x_i,y_i)=z?

I have a matrix such that:

A=[1 1 2; 1 2 0.5; 2 1 0.5; 2 2 1];

I would like to organize the last coloumn of array A such that,

B=[2 0.5; 0.5 1];

As we can see B(1,1)=2; B(1,2)=0.5; B(2,1)=0.5; B(2,2)=1.

The coordinate B(x,y) come from the from x corresponds to A(:,1) and y corresponds to A(:,2). Can anyone suggest me how should I approach? Thank you.

Answer 1

[Stephen23]

The trick is to use https://www.mathworks.com/help/matlab/ref/sub2ind.html

A = [1,1,2;1,2,0.5;2,1,0.5;2,2,1]

A = 4×3

1.0000 1.0000 2.0000 1.0000 2.0000 0.5000 2.0000 1.0000 0.5000 2.0000 2.0000 1.0000

S = max(A(:,1:2),[],1);
B = nan(S);
B(sub2ind(S,A(:,1),A(:,2))) = A(:,3)

B = 2×2

2.0000 0.5000 0.5000 1.0000

[Md. Hasan Rahman]

Thank you very much.