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Re: How to Calculate NPV?

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From Terry Reedy <tjreedy@udel.edu>
Subject Re: How to Calculate NPV?
Date Wed, 29 Jul 2015 15:08:25 -0400
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On 7/29/2015 10:21 AM, ryguy7272 wrote:
> On Wednesday, July 29, 2015 at 9:59:10 AM UTC-4, ryguy7272 wrote:
>> I am using Spyder Python 2.7.  I'm running this sample code.
>>
>> import scipy as sp
>> cashflows=[50,40,20,10,50]
>> npv=sp.npv(0.1,cashflows)
>> round(npv,2)
>>
>>
>> Now, I'm trying to get the NPV, and I don't see any obvious way to get it.
>> The author of the book that I'm reading gets 144.56.  I think that's wrong, but I don't know for sure, as Python won't do any calculation at all.  It's easy to enter code and run it, but I can't tell how to get Python to actually DO the calculation.
>>
>> Any idea what I'm doing wrong?
>
> PERFECT!!  SO SIMPLE!!
> I don't know why the author didn't do that in the book.

The book show you how to calculate things.  It is up to you to display, 
output to a file, or use in further calculation.  I do admit, though, 
that snippets that show how to use an existing function, rather than 
define a new function, might benefit from adding print(xxxx).

-- 
Terry Jan Reedy

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Thread

How to Calculate NPV? ryguy7272 <ryanshuell@gmail.com> - 2015-07-29 06:58 -0700
  Re: How to Calculate NPV? Saber Ayoub Chelaghma <saber.chelaghma@gmail.com> - 2015-07-29 07:09 -0700
  Re: How to Calculate NPV? ryguy7272 <ryanshuell@gmail.com> - 2015-07-29 07:21 -0700
    Re: How to Calculate NPV? ryguy7272 <ryanshuell@gmail.com> - 2015-07-29 07:27 -0700
      Re: How to Calculate NPV? duncan smith <buzzard@invalid.invalid> - 2015-07-29 17:14 +0100
    Re: How to Calculate NPV? Terry Reedy <tjreedy@udel.edu> - 2015-07-29 15:08 -0400
    Re: How to Calculate NPV? Dave Farrance <df@see.replyto.invalid> - 2015-07-30 15:18 +0100

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