1. Limited time only! Sign up for a free 30min personal 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!

How does one define a sigmoidal function

  1. Jan 6, 2013 #1
    I am trying to model a 'perturbation function' and I finally arrive at a S-shaped graph,which I later found was called a 'sigmoid'. Is a sigmoid defined based on its inflection point? How does one classify a curve as a 'sigmoid'?
    Can i say that a certain function f is a sigmoid just because it has a S-shaped curve?What about skewed S-shaped curves?Are they sigmoids also?
    What are the constraints?
    Last edited: Jan 7, 2013
  2. jcsd
  3. Jan 7, 2013 #2


    Staff: Mentor

Share this great discussion with others via Reddit, Google+, Twitter, or Facebook