A formula for IRR

[akmon]

With this code:

Code:

EXPORT IRR()
BEGIN    
   return fsolve(ΣLIST(MAKELIST((L1(I)/X^(I-1)),I,1,SIZE(L1))),X)-1; //  (Original command line from Akmon)
END;

and your 10 numbers list,
I get 0,13917 in home and CAS mode, directly.