code: def ncf_cdf(x, dfn, dfd, nc):
      return special.ncfdtr(dfn, dfd, nc, x)
  
imports: import warnings
  import numpy
  from scipy import stats, optimize, special
  from statsmodels.tools.rootfinding import brentq_expanding
label_desc: Use image node_id 3 for calling a global function with example usage: ncf_cdf(x, dfn, dfd, nc) and returns: special