Can I call MS Excel Function in Oracle

Hi everyone,
I prototyped my application in Microsoft Excel. In this prototype, I'm using the BETADIST() function, which returns the cumulative beta probability density function. And, yes, if you're like me, and not a statistician, it's pretty crazy. Just for fun, check out the wikipedia page on it, and you'll see what I mean. Anyway, so now, I'm trying to perform the same functionality as that function in my Oracle APEX 4.0/Oracle 10g-R2 app.
I've studied this function a bunch, and I couldn't find an equivalent function in Oracle to do what this function does. CUME_DIST... nope, DBMS_STATS_FUNC... nope. So, I assumed I would need to figure out what exactly the function does and basically rewirte it in Oracle using PL/SQL. I've already got questions out on Statistics and Excel forums trying to figure that out.
But, before I go any further and reinvent the wheel by coding out the logic embedded in this function (which is very hairy, of course), I wanted to check with you all and see if there's a way to invoke this MS Excel function through Oracle. Not sure if an external procedure can get to an Excel library, or how to do it if it can.
Any ideas?
Thanks!
Mark

I'm pretty sure this BETADIST exists in Java already.Not natively I think.
But one can download Cern's COLT Libraries for High Performance Scientific and Technical Computing in Java.
Loading the libraries via loadjava
loadjava -user michael/xxxx@oracle_server:1521:oracle_sid -verbose -force -order -resolve -thin colt.jar concurrent.jarand creating a function
create or replace function betadist (alpha number, beta number, c number)
     return number
as
     language java
     name 'cern.jet.stat.Gamma.incompleteBeta(double, double, double) return double';
/is rather straightforward.
Calling it
SQL> select betadist(4,5,0.4) from dual
BETADIST(4,5,0.4)
         ,4059136
1 row selected.the result coincides quite well with the example given in http://www.excelfunctions.net/Excel-Beta-Dist-Function.html.

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