#1(a)
f(x)=x**3-0.5*x**2-x+0.5
Xreg=[]
Yreg=[]
for i in srange (-1,1.1,0.1):
    Xreg+=[i]
    Yreg+=[f(i)]

#2(a)
def Regularistaion(X,Y):
    len(X)=n
    Xapp=[]
    Yapp=[]
    for i in range (n):
        Xapp+=[ X[i]+i*(Y[i]-X[i])/n ]
        f(x)= (Y[i]-Y[i-1])/(X[i]-X[i-1]) * (x-X[i-1])+Y[i-1]
        Yapp+= [f(Xapp[i])]