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[section:gamma_derivatives Derivative of the Incomplete Gamma Function]
[h4 Synopsis]
``
#include <boost/math/special_functions/gamma.hpp>
``
namespace boost{ namespace math{
template <class T1, class T2>
``__sf_result`` gamma_p_derivative(T1 a, T2 x);
template <class T1, class T2, class ``__Policy``>
``__sf_result`` gamma_p_derivative(T1 a, T2 x, const ``__Policy``&);
}} // namespaces
[h4 Description]
This function find some uses in statistical distributions: it
implements the partial derivative with respect to /x/ of the incomplete
gamma function.
[equation derivative1]
[optional_policy]
Note that the derivative of the function __gamma_q can be obtained by negating
the result of this function.
The return type of this function is computed using the __arg_pomotion_rules
when T1 and T2 are different types, otherwise the return type is simply T1.
[h4 Accuracy]
Almost identical to the incomplete gamma function __gamma_p: refer to
the documentation for that function for more information.
[h4 Implementation]
This function just expose some of the internals of the incomplete
gamma function __gamma_p: refer to the documentation for that function
for more information.
[endsect][/section Derivative of the Incomplete Gamma Functions]
[/
Copyright 2006 John Maddock and Paul A. Bristow.
Distributed under the Boost Software License, Version 1.0.
(See accompanying file LICENSE_1_0.txt or copy at
http://www.boost.org/LICENSE_1_0.txt).
]
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