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IRR Problem

Hi everyone:
I am trying to use the IRR function that comes as part of the
Financial Library in VB6, but it is returning some weird values.
The case i am testing is fairly simple:

initial investment = 100000
withdrawals (at beginning of year) from 4 to 10 = 10000
end Account Value = 599448

The time spam is 226 months. So i am passing an array of size 227 (
from 1 to 227) to the function with position 1 equal to -100000, then
all other positions equal to zero (no transaction in those months)
except positions 37,49,61,73,85,97,109, which contain 10000
(withdrawal amount) and last position 227 which contains the Account
Value = 599448.
When i run the function returns 0.
I just discovered that if i make my time spam (collection size) equal
to 50 and modify the collection accrodingly i would get a result
greater than zero. So it seems there is a problem with arrays size
greater than 50 and this function. Any idea how to go around the
problem?

Thanks a lot
Jul 17 '05 #1
1 3362

"Idelso Quintero" <id*************@insurance.sungard.com> wrote in message
news:61**************************@posting.google.c om...
Hi everyone:
I am trying to use the IRR function that comes as part of the
Financial Library in VB6, but it is returning some weird values.
The case i am testing is fairly simple:

initial investment = 100000
withdrawals (at beginning of year) from 4 to 10 = 10000
end Account Value = 599448

The time spam is 226 months. So i am passing an array of size 227 (
from 1 to 227) to the function with position 1 equal to -100000, then
all other positions equal to zero (no transaction in those months)
except positions 37,49,61,73,85,97,109, which contain 10000
(withdrawal amount) and last position 227 which contains the Account
Value = 599448.
When i run the function returns 0.
I just discovered that if i make my time spam (collection size) equal
to 50 and modify the collection accrodingly i would get a result
greater than zero. So it seems there is a problem with arrays size
greater than 50 and this function. Any idea how to go around the
problem?

Thanks a lot


Check to ensure you dim doubles, i.e.
Static Values(227) As Double ' Set up array.

Make sure you have a non-zero for guess (i.e. 0.15) or something like that..

Last.. why don't you post your code so we can see what we might be missing
from your description.
Jul 17 '05 #2

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