.. index:: pair: struct; forcefields::Ccl::Rho
.. _doxid-structforcefields_1_1_ccl_1_1_rho:

struct forcefields::Ccl::Rho
============================

.. toctree::
	:hidden:

Overview
~~~~~~~~

:math:`\rho` parameter in paper. :ref:`More...<details-structforcefields_1_1_ccl_1_1_rho>`


.. ref-code-block:: cpp
	:class: doxyrest-overview-code-block

	#include <ccl.hpp>
	
	struct Rho {
		// fields
	
		double :ref:`_1<doxid-structforcefields_1_1_ccl_1_1_rho_1a685bc9a370cb568f4eb6c2f6ba0c5f1c>`;
		double :ref:`_2<doxid-structforcefields_1_1_ccl_1_1_rho_1a1e0a995cb153192889b5773a325e12c0>`;
		double :ref:`_3<doxid-structforcefields_1_1_ccl_1_1_rho_1a2ce33b4273301c4d68eb71157a996f4b>`;
		double :ref:`n<doxid-structforcefields_1_1_ccl_1_1_rho_1a502a83fc72271bd5281547a1d7b9a199>`[3];
	};
.. _details-structforcefields_1_1_ccl_1_1_rho:

Detailed Documentation
~~~~~~~~~~~~~~~~~~~~~~

:math:`\rho` parameter in paper.



.. rubric:: See also:

:ref:`forcefields::Ccl <doxid-classforcefields_1_1_ccl>`

Fields
------

.. index:: pair: variable; _1
.. _doxid-structforcefields_1_1_ccl_1_1_rho_1a685bc9a370cb568f4eb6c2f6ba0c5f1c:

.. ref-code-block:: cpp
	:class: doxyrest-title-code-block

	double _1

rho^1

.. index:: pair: variable; _2
.. _doxid-structforcefields_1_1_ccl_1_1_rho_1a1e0a995cb153192889b5773a325e12c0:

.. ref-code-block:: cpp
	:class: doxyrest-title-code-block

	double _2

rho^2

.. index:: pair: variable; _3
.. _doxid-structforcefields_1_1_ccl_1_1_rho_1a2ce33b4273301c4d68eb71157a996f4b:

.. ref-code-block:: cpp
	:class: doxyrest-title-code-block

	double _3

rho^3

.. index:: pair: variable; n
.. _doxid-structforcefields_1_1_ccl_1_1_rho_1a502a83fc72271bd5281547a1d7b9a199:

.. ref-code-block:: cpp
	:class: doxyrest-title-code-block

	double n[3]

Convert derivative to force. Vector *n* is by definition the vector which satisfy the equation:

.. math::

	\mathbf{F}=-\frac{dE}{d\rho}\mathbf{n}

It is equal to:

.. math::

	\mathbf n=\frac{\mathbf{r}}{|\mathbf{r}|}\frac{r_e}{\rho^2}