Dear Joaquín,
>From your previous posts I assume that all of PeFT, Pe[qs] and F[qs]
represent rank 2 tensors. If this is correct then no, the contraction
indices that you've specified are not correct. They're out of the range
[0,1] that are valid for rank-2 tensors, and this would presumably trigger
an assertion in debug mode (at the very least).
For simplicity, lets call these three rank-2 tensors "A,B,C". Then we could
compute the two possible single index contraction results, expressed in
index notation, as follows:
(1a) A_{ij} = B_{ik} C_{kj} --> A = contract<1,0>(B,C); // The second
index of the first tensor contracts with the first index of the second
tensor
or, more simply,
(1b) A = B*C;
(2)A_{ij} = B_{ik} C_{kj} --> A = contract<1,1>(B,C); // The second index
of the first tensor contracts with the second index of the second tensor
Does this explain a bit better how the function works?
Regards,
J-P
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