Amortization table problem

```I am trying to set up a dynamic amortization schedule that allows me t
change the loan variables (interest rate, length of loan, amount, etc.
I am using the PPMT and IPMT functions to calculated the principal an
interest payments for each period.  My model covers a 30 year tim
horizon.

The problem occurs when I set the loan time less than 30 years.  Fo
example, for a 20 year loan I have a line that counts 1, 2, 3, ..., 20
0, 0, to tell the PPMT and IPMT equations which period to calculate.
But when it reaches year 21, a zero feeds into the PPMT equation fo
time period, resulting in a #NUM! problem.  It works fine if the loa
lengths is 30 years.  But less than 30 and I get the error.

Is there any way to set this up so that a zero doesn't feed into th
PPMT and IPMT equations, while still retaining the dynamic function?
don't want to hard code the number of years evertime I change the loa
length.

Thanks for the help.  This is driving me crazy

-----------------------------------------------
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```
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11/13/2003 3:24:46 PM
excel.misc 78881 articles. 5 followers.

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```Try using an error trap.

between the quotations you can place anything you want to
see.  If you want a numeric value, omit the quotes
hth
>-----Original Message-----
>
>I am trying to set up a dynamic amortization schedule
that allows me to
>change the loan variables (interest rate, length of
loan, amount, etc.)
>I am using the PPMT and IPMT functions to calculated the
principal and
>interest payments for each period.  My model covers a 30
year time
>horizon.
>
>The problem occurs when I set the loan time less than 30
years.  For
>example, for a 20 year loan I have a line that counts 1,
2, 3, ..., 20,
>0, 0, to tell the PPMT and IPMT equations which period
to calculate.
>But when it reaches year 21, a zero feeds into the PPMT
equation for
>time period, resulting in a #NUM! problem.  It works
fine if the loan
>lengths is 30 years.  But less than 30 and I get the
error.
>
>Is there any way to set this up so that a zero doesn't
feed into the
>PPMT and IPMT equations, while still retaining the
dynamic function?  I
>don't want to hard code the number of years evertime I
change the loan
>length.
>
>Thanks for the help.  This is driving me crazy.
>
>
>------------------------------------------------
>~~ Message posted from http://www.ExcelTip.com/
>~~View and post usenet messages directly from
http://www.ExcelForum.com/
>
>.
>
```
 0
anonymous (74719)
11/13/2003 3:53:17 PM

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