(Plus42) Cash Flow Analysis: NPV, IRR%, MIR%, FMR%

[Werner]

Read the book, and indeed, I learned a few things more, namely the rules governing the use of the direct vs. iterative solver. So my question..
Take this simplified equation performing NPV and IRR% only:

Code:

NPVIRR:0*(
  L(N:MROWS(CF))+
  L(M:MCOLS(CF))+
  IRR%+NPV+
  L(P:0)+
  L(R:1+IRR%/100)+
  IF(G(M)=1:
      Σ(I:G(N):1:-1:L(P:(G(P)+CF[I])/G(R))):
      Σ(I:G(N):1:-1:L(Nj:CF[I:2])+L(P:G(P)*SPPV(IRR%:G(Nj))+CF[I:1]*USPV(IRR%:G(Nj))))
  )
)+
G(NPV)-G(P)*G(R)

If I understood the rules correctly, it should use the direct solver for NPV and the iterative one for IRR%, but how can I tell?

Cheers, Werner