1. Not finding help here? Sign up for a free 30min tutor trial with Chegg Tutors
    Dismiss Notice
Dismiss Notice
Join Physics Forums Today!
The friendliest, high quality science and math community on the planet! Everyone who loves science is here!

Getting Power Function given points.

  1. Oct 20, 2008 #1
    1. The problem statement, all variables and given/known data

    I have 4 points (x and y values) and I was wondering how I can make an equation out of it.
    It looks like a decaying function.

    2. Relevant equations

    n/a

    3. The attempt at a solution

    n/a

    I absolutely have no idea how to approach this...Sorry.
     
  2. jcsd
  3. Oct 20, 2008 #2

    Tom Mattson

    User Avatar
    Staff Emeritus
    Science Advisor
    Gold Member

    That's quite an open-ended problem you've got there. You could fit polynomials of degrees 1, 2, 3, or 4 to your data set. And who says it has to be a polynomial? Why not an exponential? My advice would be to pick some functional form, and then try to make a best fit.
     
  4. Oct 21, 2008 #3

    HallsofIvy

    User Avatar
    Staff Emeritus
    Science Advisor

    Since you refer to a "power function" and "decaying function" I would guess that you are looking for a function of the for y= abx. Two values of (x,y) will give two equations to solve for a and b.
     
Know someone interested in this topic? Share this thread via Reddit, Google+, Twitter, or Facebook

Have something to add?