I have some data that looks like this
A B C
0 a0 b0 0,0
1 a1 b1 1,1
2 a2 b2 2,2
3 a0 b1 0,1
4 a0 b2 0,2
...
for an analysis it ended up becoming
C
B b0 b1 b2
A
a0 0,0 0,1 0,2
a1 1,0 1,1 1,2
a2 2,0 2,1 2,2
where the values of C correspond to <a_index>,<b_index>.
from this structure, how do I go back to the first?
