from java.awt import* 
from jhplot  import * 
from jhplot.math.exp4j import *
from jhplot.math.exp4j.function import * 


class cf2(Function):
     def  apply(self,val):
         a=val[0]*val[0]*val[0] 
         if (val[0]<0): return 0
         if (val[0]>0): return a
         return 0


e=ExpressionBuilder("cf2(x)")
func=cf2("cf2",1);
e.function(func)
e.variables("x")
fff=e.build()
fff.setVariable("x", 10);
print fff.evaluate()