#include <processor.h>
Inheritance diagram for EMAN::ModelHelixProcessor:


Protected Member Functions | |
| float | radprofile (float r, int type) |
|
||||||||||||
|
Definition at line 9542 of file processor.cpp. Referenced by EMAN::ApplyPolynomialProfileToHelix::process_inplace(), and EMAN::ModelEMCylinderProcessor::process_inplace(). 09543 : modified from EMAN1 Cylinder.C by Wen Jiang
09544 {
09545 // r in angstrom
09546 double ret = 0;//iterations ==> rounding is problematic with float types if 15 < r < 20 and really bad if 20 < r < 30
09547 if (type == 0) { // pure Gaussian falloff
09548 r /= 2;
09549 ret = exp(-r * r);
09550 } else if (type == 1) { // pure Gaussian falloff + negative dip, so mean is 0
09551 r /= 2;
09552 ret = (1 - r * r / 4) * exp(-r * r / 4);
09553 } else if (type == 2) {
09554 // polynomial fitting to the radial profile of real helix density
09555 // f=a0*x^n+a1+x^(n-1)+ ... +a[n-1]*x+an
09556 //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};
09557
09558 // now the fitting to the original profile
09559 if (r >= 12.2)
09560 return 0; //We don't want that part of the polynomial --> goes way below zero
09561 static float an[15] = { -3.9185246832229140e-16f,
09562 3.3957205298900993e-14f, 2.0343351971222658e-12f,
09563 -4.4935965816879751e-10f, 3.0668169835080933e-08f,
09564 -1.1904544689091790e-06f, 2.9753088549414953e-05f,
09565 -4.9802112876220150e-04f, 5.5900917825309360e-03f,
09566 -4.0823714462925299e-02f, 1.8021733669148599e-01f,
09567 -4.0992557296268717e-01f, 3.3980328566901458e-01f,
09568 -3.6062024812411908e-01f, 1.0000000000000000e+00f };
09569
09570 ret = an[0];
09571 for (int i = 1; i < 15; i++) {
09572 ret = ret * r + an[i];
09573 }
09574 }
09575 return (float)ret;
09576 }
|
1.3.9.1