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EMAN::Util::FakeKaiserBessel Class Reference

#include <util.h>

Inheritance diagram for EMAN::Util::FakeKaiserBessel:

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Collaboration diagram for EMAN::Util::FakeKaiserBessel:

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List of all members.

Public Member Functions

 FakeKaiserBessel (float alpha, int K, float r_, float v_, int N_, float vtable_=0.f, int ntable_=5999)
float sinhwin (float x) const
 Kaiser-Bessel Sinh window function.
float i0win (float x) const
 Kaiser-Bessel I0 window function.
void build_I0table ()
 2*pi*alpha*r*vadjust

Constructor & Destructor Documentation

EMAN::Util::FakeKaiserBessel::FakeKaiserBessel float  alpha,
int  K,
float  r_,
float  v_,
int  N_,
float  vtable_ = 0.f,
int  ntable_ = 5999
[inline]
 

Definition at line 382 of file util.h.

00439                 {


Member Function Documentation

void Util::FakeKaiserBessel::build_I0table  )  [virtual]
 

2*pi*alpha*r*vadjust

Reimplemented from EMAN::Util::KaiserBessel.

Definition at line 2061 of file util_sparx.cpp.

References EMAN::Util::round(), and sqrt().

02061                                          {
02062         i0table.resize(ntable+1); // i0table[0:ntable]
02063         int ltab = int(round(float(ntable)/1.1f));
02064         fltb = float(ltab)/(K/2);
02065         float val0 = sqrt(facadj)*static_cast<float>(gsl_sf_bessel_I1(facadj));
02066         for (int i=ltab+1; i <= ntable; i++) i0table[i] = 0.f;
02067         for (int i=0; i <= ltab; i++) {
02068                 float s = float(i)/fltb/N;
02069                 if (s < vadjust) {
02070                         float rt = sqrt(1.f - pow(s/vadjust, 2));
02071                         i0table[i] = sqrt(facadj*rt)*static_cast<float>(gsl_sf_bessel_I1(facadj*rt))/val0;
02072                 } else {
02073                         i0table[i] = 0.f;
02074                 }
02075         }
02076 }

float Util::FakeKaiserBessel::i0win float  x  )  const [virtual]
 

Kaiser-Bessel I0 window function.

Reimplemented from EMAN::Util::KaiserBessel.

Definition at line 2052 of file util_sparx.cpp.

References sqrt(), and x.

02052                                                {
02053         float val0 = sqrt(facadj)*float(gsl_sf_bessel_I1(facadj));
02054         float absx = fabs(x);
02055         if (absx > vadjust) return 0.f;
02056         float rt = sqrt(1.f - pow(absx/vadjust, 2));
02057         float res = sqrt(facadj*rt)*float(gsl_sf_bessel_I1(facadj*rt))/val0;
02058         return res;
02059 }

float Util::FakeKaiserBessel::sinhwin float  x  )  const [virtual]
 

Kaiser-Bessel Sinh window function.

Reimplemented from EMAN::Util::KaiserBessel.

Definition at line 2078 of file util_sparx.cpp.

References sqrt(), and x.

02078                                                  {
02079         float val0 = sinh(fac)/fac;
02080         float absx = fabs(x);
02081         if (0.0 == x) {
02082                 float res = 1.0f;
02083                 return res;
02084         } else if (absx == alphar) {
02085                 return 1.0f/val0;
02086         } else if (absx < alphar) {
02087                 float rt = sqrt(1.0f - pow((x/alphar), 2));
02088                 float facrt = fac*rt;
02089                 float res = (sinh(facrt)/facrt)/val0;
02090                 return res;
02091         } else {
02092                 float rt = sqrt(pow((x/alphar),2) - 1.f);
02093                 float facrt = fac*rt;
02094                 float res = (sin(facrt)/facrt)/val0;
02095                 return res;
02096         }
02097 }


The documentation for this class was generated from the following files:
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