class_docstr: The Resels class.
      
class_docstr_tok: ["The","Resels","class","."]
docstr: Convert FWHM `fwhm` to equivalent reseels per voxel
  
  Parameters
  ----------
  fwhm : float
      Convert an FWHM value to an equivalent resels per voxel based on
      step sizes in self.coordmap.
  
  
  Returns
  -------
  resels : float
docstr_tok: ["Convert","FWHM","`","fwhm","`","to","equivalent","reseels","per","voxel","Parameters","--","--","--","--","--","fwhm",":","float","Convert","an","FWHM","value","to","an","equivalent","resels","per","voxel","based","on","step","sizes","in","self.coordmap",".","Returns","--","--","--","-","resels",":","float"]
code: def fwhm2resel(self, fwhm):
      """Convert FWHM `fwhm` to equivalent reseels per voxel
  
      Parameters
      ----------
      fwhm : float
          Convert an FWHM value to an equivalent resels per voxel based on
          step sizes in self.coordmap.
  
  
      Returns
      -------
      resels : float
      """
      return pos_recipr(
          np.power(fwhm / np.sqrt(4 * np.log(2)) * self.wedge, self.D)
      )
  
file_path: nipy/nipy/algorithms/fwhm.py
imports: import numpy
  from numpy.linalg import det
  from nipy.core.api import Image
  from .utils.matrices import pos_recipr
label_desc: Use image node_id 4 for calling the Resels obj's underlying member method code with example usage: obj.fwhm2resel(fwhm) and returns: pos_recipr