What is the Le Bail method
“Iterating the Rietveld decomposition formula, starting
from a set of identical |F|s instead of |Fcal|s" :
That is the way. The programmer knowing how to implement
the Rietveld method will see how to do it.”
To implement is simple. At the point where calculated |F| are entered in the Rietveld decomposition formula (SUMMAT
subroutine in old code), put instead a set of identical
|F|, let the program do as usual, then, when getting the
"|Fobs|" from this decomposition formula, use them
as if they were the new |Fcalc| and continue to iterate