#include <processor.h>
Inheritance diagram for EMAN::ModelHelixProcessor:
Protected Member Functions | |
float | radprofile (float r, int type) |
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Definition at line 9810 of file processor.cpp. Referenced by EMAN::ApplyPolynomialProfileToHelix::process_inplace(), and EMAN::ModelEMCylinderProcessor::process_inplace(). 09811 : modified from EMAN1 Cylinder.C by Wen Jiang 09812 { 09813 // r in angstrom 09814 double ret = 0;//iterations ==> rounding is problematic with float types if 15 < r < 20 and really bad if 20 < r < 30 09815 if (type == 0) { // pure Gaussian falloff 09816 r /= 2; 09817 ret = exp(-r * r); 09818 } else if (type == 1) { // pure Gaussian falloff + negative dip, so mean is 0 09819 r /= 2; 09820 ret = (1 - r * r / 4) * exp(-r * r / 4); 09821 } else if (type == 2) { 09822 // polynomial fitting to the radial profile of real helix density 09823 // f=a0*x^n+a1+x^(n-1)+ ... +a[n-1]*x+an 09824 //float an[11]={2.847024584977009e-10,-3.063997224364090e-08,1.418801040660860e-06,-3.678676414383996e-05,5.804871622801710e-04,-5.640340018430164e-03,3.208802421493864e-02,-9.068475313823952e-02,7.097329559749284e-02,-9.993347339658298e-02,1.000000000000000e+00}; 09825 09826 // now the fitting to the original profile 09827 if (r >= 12.2) 09828 return 0; //We don't want that part of the polynomial --> goes way below zero 09829 static float an[15] = { -3.9185246832229140e-16f, 09830 3.3957205298900993e-14f, 2.0343351971222658e-12f, 09831 -4.4935965816879751e-10f, 3.0668169835080933e-08f, 09832 -1.1904544689091790e-06f, 2.9753088549414953e-05f, 09833 -4.9802112876220150e-04f, 5.5900917825309360e-03f, 09834 -4.0823714462925299e-02f, 1.8021733669148599e-01f, 09835 -4.0992557296268717e-01f, 3.3980328566901458e-01f, 09836 -3.6062024812411908e-01f, 1.0000000000000000e+00f }; 09837 09838 ret = an[0]; 09839 for (int i = 1; i < 15; i++) { 09840 ret = ret * r + an[i]; 09841 } 09842 } 09843 return (float)ret; 09844 }
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