A formula for IRR

[salvomic]

(05-19-2015 12:10 PM)DrD Wrote:  solve.SOLVE() results in syntax error also. Compiler doesn't like the upper case SOLVE.

hi Dale, I'm outside (but with Prime with me), I tried "at fly" this
solve(ΣLIST(MAKELIST((L1(I)/X^(I-1)),I,1,SIZE(L1))),X)-1;
solve() all lowercase.
It works fine in Home and in CAS (but here it gives a warning, see above), giving one or more results (IRR ca have more, at least one positive,...)
This evening I'll try better, but perhaps it works. Period :-)

(05-19-2015 12:27 PM)akmon Wrote:  EDITLIST(L1,"Internal Rate of Return"); which saves changes to L1, and sto(EDITLIST(L1,"Internal Rate of Return"),L1); just stores those same results again.
...

Aaah, ok, I didn´t know EDITLIST autostores the list on the same variable when OK is pressed. Thank you for the info. Less code. ;-)
[/quote]

yse, Editlist works, but only in Home (in CAS it is been opened but any changes will be lose, I don't know why, exactly...).

Evening, at home, I'll try writing a better version

...but remain a problem: EDITLIST edits and save the list, but if the list doesn't already exists, the program gives error, so we need a control to see if the variable exists, like the "C" if (!flows) ...

Salvo