Re: [Boost-users] Using <boost/math/distributions/non_central_t.hpp> gives unexpected error

Subject: Re: [Boost-users] Using <boost/math/distributions/non_central_t.hpp> gives unexpected error
From: Paul A. Bristow (pbristow_at_[hidden])
Date: 2012-08-02 10:06:39

From: boost-users-bounces_at_[hidden] [mailto:boost-users-bounces_at_[hidden]] On Behalf Of
Avinash K. Hathiramani
Sent: Thursday, August 02, 2012 2:53 PM
To: boost-users_at_[hidden]
Subject: Re: [Boost-users] Using <boost/math/distributions/non_central_t.hpp> gives unexpected error
 
Hi Paul and John,
 
Thank you both for your replies.
 
Paul - thank you for attaching your .cpp. I have created a new project and simply copied and pasted
your exact code into my main, but I still get the same error as before. Please see below for some
additional information on my setup.

> Your code works for me with both VC10 and gcc-4.6 Mingw, both output:
> 
> Probability density of Student's t is 0.425022
> Cumulative probability of Student's t is 0.425022
> 
> Can you give us details of the compiler/platform and any other relevant 
> information (for example have you set any of the policy changing macros 
> described in the docs?)
> 
I am using Code::Blocks 10.05, and using the gcc-3.81 Mingw compiler. (My system is Windows XP
Professional (Service Pack 3), 32-bit). I have not used Boost previously and am not using too many
of it's functions at the moment, so I have not made any changes to the settings (or set any policy
changing macros). I'm still a bit new to using external libraries, so I've just done the most basic
installation. Also, I am using Boost 1.49.0 - sorry I should have mentioned this in my first post.
 
No code changes to this since Boost 1.49 so that should be fine.
 
Boost.Math does not *require* any libraries to be installed, only to include the headers - ie header
only.  (In act you should NOT build a library).
 
So you should only link to anything required to get a hello world example to run.  (make sure one
does?)
 
Do you get this error message from my code?
 
  "Error in function boost::math::gamma_p_derivative<e>(e, e): numeric overflow".
 
This is most odd because it appears to be type 'e'????  not double, float etc.
 
When does it throw - can you show the 'echoed' df and non-centrality OK?
 
does the pdf work?  or the cdf? on their own?
 
Try some simpler examples using Boost.Math - perhaps
\libs\math\example\distribution_construction.cpp.
 
HTH
 
Paul