EMAN::Interp Class Reference

Interp defines the interpolation function used to generate a e^-x^4 function in real space. More...

#include <interp.h>

Static Public Member Functions
static float	get_hyperg (int i)
static float	hyperg (float v)
static float *	get_gimx ()

Static Private Member Functions
static void	init_gimx ()

Static Private Attributes
static float	HYPERGEOM []
static float *	gimx = 0

Detailed Description

Interp defines the interpolation function used to generate a e^-x^4 function in real space.

Used for Fourier interpolation

Definition at line 43 of file interp.h.

Member Function Documentation

get_gimx()

static float * EMAN::Interp::get_gimx ( )

inlinestatic

Definition at line 62 of file interp.h.

                {
                        if (!gimx) {
                                init_gimx();
                        }
                        return gimx;
                }

References gimx, and init_gimx().

Referenced by EMAN::GaussFFTProjector::interp_ft_3d().

get_hyperg()

static float EMAN::Interp::get_hyperg ( int  i )

inlinestatic

Definition at line 46 of file interp.h.

                {
                        return HYPERGEOM[i];
                }

References HYPERGEOM.

hyperg()

static float EMAN::Interp::hyperg ( float  v )

inlinestatic

Definition at line 51 of file interp.h.

                {
                        if (v < 0 || v > 4.998f) {
                                return 0;
                        }
                        float r = v / 0.001f;
                        int a = (int) floor(r);
                        r -= a;
                        return (float)(-(HYPERGEOM[a] * (1.0 - r) + HYPERGEOM[a + 1] * r));
                }

References HYPERGEOM.

Referenced by EMAN::GaussFFTProjector::interp_ft_3d().

init_gimx()

void Interp::init_gimx ( )

staticprivate

Definition at line 1711 of file interp.cpp.

{
        const int size = 100;
        gimx = new float[size * size * size];
        const float g = (float) (10.4 / (M_PI * M_PI)); // magic number here
 
        for (int k = 0; k < size; k++) {
                for (int j = 0; j < size; j++) {
                        for (int i = 0; i < size; i++) {
                                float r = Util::hypot3(i / 39.0f, j / 39.0f, k / 39.0f);
                                gimx[i + j * size + k * size * size] = exp(-r / g);
                        }
                }
        }
}

References gimx, and EMAN::Util::hypot3().

Referenced by get_gimx().

Member Data Documentation

gimx

float * Interp::gimx = 0

staticprivate

Definition at line 75 of file interp.h.

Referenced by get_gimx(), and init_gimx().

HYPERGEOM

float Interp::HYPERGEOM

staticprivate

Definition at line 74 of file interp.h.

Referenced by get_hyperg(), and hyperg().

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

• interp.h
• interp.cpp