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/***********************************************/
/**
* @file kernelTruncation.h
*
* @brief Kernel truncated at spherical harmonic degree
* @see Kernel
*
* @author Andreas Kvas
* @date 2019-03-01
*
*/
/***********************************************/
#ifndef __GROOPS_KERNELTRUNCATION__
#define __GROOPS_KERNELTRUNCATION__
// Latex documentation
#ifdef DOCSTRING_Kernel
static const char *docstringKernelTruncation= R"(
\subsection{Truncation}
Another \configClass{kernel}{kernelType} is truncated before \config{minDegree} and after \config{maxDegree}.
The coefficients of this kernel are defined as
\begin{equation}
k_n =
\begin{cases}
1 & \text{for } n_{\text{minDegree}} \leq n \leq n_{\text{maxDegree}}\\
0 & \text{else.} \\
\end{cases}
\end{equation}
)";
#endif
/***********************************************/
#include "classes/kernel/kernel.h"
/***** CLASS ***********************************/
/** @brief Kernel truncated at spherical harmonic degree.
* @ingroup kernelGroup
* @see Kernel */
class KernelTruncation : public Kernel
{
KernelPtr _kernel;
UInt _minDegree;
UInt _maxDegree;
public:
KernelTruncation(Config &config);
Vector coefficients (const Vector3d &p, UInt degree) const;
Vector inverseCoefficients(const Vector3d &p, UInt degree, Bool interior) const;
UInt maxDegree() const {return _maxDegree;}
};
/***********************************************/
#endif
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