class_docstr: Results from an F :term:`contrast` of coefficients        in a parametric model.
  
  The class does nothing.
  It is a container for the results from F :term:`contrasts<contrast>`,
  and returns the F-statistics when np.asarray is called.
class_docstr_tok: ["Results","from","an","F",":","term",":","`","contrast","`","of","coefficients","in","a","parametric","model",".","The","class","does","nothing",".","It","is","a","container","for","the","results","from","F",":","term",":","`","contrasts","<","contrast",">","`",",","and","returns","the","F-statistics","when","np.asarray","is","called","."]
code: def __str__(self):
      return (
          "<F contrast: "
          f"F={repr(self.F)}, "
          f"df_den={self.df_den}, "
          f"df_num={self.df_num}>"
      )
  
imports: import numpy
  from nibabel.onetime import auto_attr
  from scipy.linalg import inv
  from scipy.stats import t
  from nilearn.glm._utils import pad_contrast, positive_reciprocal
label_desc: Use image node_id 3 for calling the FContrastResults obj's underlying member method code with example usage: obj.__str__() and returns: str, repr, str, self, str, self, str