Mathematics of business and finance problem using python

Question

pv = float(input("Enter your present value here: "))
pmt = float(input("Enter your periodic payment in an annuity(PMT) here: "))
i = float(input("""Enter your periodic interest rate as decimal number 
ex: 30% = 0.3
Enter your periodic interest rate here: """)
npgpv = -math.log( 1 - ( ( 1 * pv ) / pmt ) ) / math.log( 1 + i ) 
print("Result: ", npgpv)

it's giving me fallowing error:
npgpv = -math.log( 1 - ( i * pv ) ) ValueError: math domain error

What can I do to calculate this formula ?

Make sure the value you extract log of is not negative. – Catalina Chircu May 23 '20 at 02:44 — Catalina Chircu, May 23 '20 at 02:44

score 0 · Answer 1 · answered May 23 '20 at 01:36

0

I think that the error is caused because you are trying to get the log of a negative number; see https://stackoverflow.com/a/15890593/13314450

answered May 23 '20 at 01:36

CircuitSacul

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Mathematics of business and finance problem using python

1 Answers1