MathGroup Archive 1994

[Date Index] [Thread Index] [Author Index]

Search the Archive

Alternating sums

  • To: mathgroup at
  • Subject: [mg328] Alternating sums
  • From: Jack Goldberg <Jack.Goldberg at>
  • Date: Tue, 13 Dec 1994 11:30:47 -0500 (EST)

Hello mathgroup:
I have received many responses to my query on how "best" to convert a 
list to an "alternating sum".  My thanks to all of you who responded. It 
was surprising to see how many of you took an interest in this question - 
although one respondent predicted a deluge of answers.  My guess is that 
many of you are curious about the answers I received.  As soon as I 
finish designing and grading finals I will summarize the responses.  To 
tease you all, I will add that the answers fall into two major catagories
depending on whether Length[mylist] is used explicitly. If you avoid 
Length then the parity of the number of entries in the list may become a 

  • Prev by Date: Re: alternating sums
  • Next by Date: tiff or gif
  • Previous by thread: Re: alternating sums
  • Next by thread: Re: alternating sums