import scipy as sp
from matplotlib.pyplot import *
cashflows=[-100, 50, 60, 70]
rate=[]
npv=[]
x=(0, 0.7)
y=(0, 0)
for i in range(1,70):
rate.append(0.01*i)
npv.append(sp.npv(0.01*i,cashflows))
#npv.append(sp.npv(0.01*i,cashflows[1:])+cashflows[0])
point = round(sp.irr(cashflows), 2)
print(point)
plot(rate,npv)
plot(x,y)
plot(point, 0, 'ro' )
figtext(point,0.2,str(point))
show()
def irr(*args):
return scipy.irr(args[0])
#!/usr/bin/env python3
""" p. 149
IRR: Internal Rate of Return
Definition:
The interest rate at which the net present value of all the
cash flows (both positive and negative) from a project or
investment equal zero.
Rules:
IRR > Rc : Invest
IRR < Rc : Not Invest
"""
import scipy as sp
cashflows = [-100, 30, 40, 40, 50]
print(sp.irr(cashflows))
r = sp.irr(cashflows)
print(sp.npv(r, cashflows))