March 29, 2024, 10:17:05 AM
Forum Rules: Read This Before Posting


Topic: Math help  (Read 2652 times)

0 Members and 1 Guest are viewing this topic.

Offline Corribus

  • Chemist
  • Sr. Member
  • *
  • Posts: 3471
  • Mole Snacks: +526/-23
  • Gender: Male
  • A lover of spectroscopy and chocolate.
Math help
« on: November 01, 2018, 08:06:48 PM »
Can anyone figure out a simple expression for the following series of terms (n starting at 0 or 1)? I would like to express as a summation of terms.

x, 2-x, 2+x, 4-x, 4+x, 6-x, 6+x, .

? I can't think of one. Obviously I could break it into two summations but that becomes cumbersome.

Cyberbeer to whoever comes up with something. :)
What men are poets who can speak of Jupiter if he were like a man, but if he is an immense spinning sphere of methane and ammonia must be silent?  - Richard P. Feynman

Offline Corribus

  • Chemist
  • Sr. Member
  • *
  • Posts: 3471
  • Mole Snacks: +526/-23
  • Gender: Male
  • A lover of spectroscopy and chocolate.
Re: Math help
« Reply #1 on: November 01, 2018, 11:14:21 PM »
I get to buy myself a beer. I had to use a few trigonometric functions. My expression is pretty ugly and could probably be simplified but I'm too tired.
What men are poets who can speak of Jupiter if he were like a man, but if he is an immense spinning sphere of methane and ammonia must be silent?  - Richard P. Feynman

Offline Enthalpy

  • Chemist
  • Sr. Member
  • *
  • Posts: 4041
  • Mole Snacks: +304/-59
Re: Math help
« Reply #2 on: November 05, 2018, 02:22:14 PM »
Would this fit your needs?
n+0.5+(-1)n(x-0.5)
starts giving x for n=0.

(-1)n could be cos(n×π) if any better.

Sponsored Links