From: Tomo Kazahaya <tomonacci@...>
Date: 2011-08-03T09:37:55+09:00
Subject: Re: Argument error in ludcmp when using Newton module

Hi Bill,

You got the error because your Function#values returned a Float
instead of a BigDecimal.
While BigDecimal#div can take up to two arguments, Float#div takes only one.
Here is a modified version of your code: http://pastebin.com/C9ratXer
Hope this helps.

Tomo

On Fri, Jul 29, 2011 at 8:17 PM,  <wkranec@gmail.com> wrote:
> Hi,
>
> I am trying to use bigdecimal/newton for an implementation of XIRR.  A
> copy of the code I am trying to run can be found here:
> http://pastebin.com/VVMB4bRs
>
> When I run the code (Ruby 1.9.2 on Mac OS X 10.6), I get the following error:
>
> /opt/local/lib/ruby1.9/1.9.1/bigdecimal/ludcmp.rb:84:in `div': wrong
> number of arguments(2 for 1) (ArgumentError)
>        from /opt/local/lib/ruby1.9/1.9.1/bigdecimal/ludcmp.rb:84:in `block in lusolve'
>        from /opt/local/lib/ruby1.9/1.9.1/bigdecimal/ludcmp.rb:78:in `downto'
>        from /opt/local/lib/ruby1.9/1.9.1/bigdecimal/ludcmp.rb:78:in `lusolve'
>        from /opt/local/lib/ruby1.9/1.9.1/bigdecimal/newton.rb:60:in `nlsolve'
>        from gistfile1.rb:52:in `<main>'
>
> Is this because of an error in my program, or something in the
> BigDecimal library?
>
> Any assistance in debugging this would be greatly appreciated.
>
> Thanks,
> Bill
>
>