code: def frange(self):
      for i in self.vrange():
          yield float(i.evalf())
  
imports: from sympy.core.singleton import S
  from sympy.core.symbol import Symbol
  from sympy.core.sympify import sympify
  from sympy.core.numbers import Integer
label_desc: Use image node_id 20 for calling the PlotInterval obj's underlying member method code with example usage: obj.frange() without return types