Dismiss Notice
Join Physics Forums Today!
The friendliest, high quality science and math community on the planet! Everyone who loves science is here!

Homework Help: Construct a free cubic spline

  1. Dec 12, 2005 #1
    Construct a free cubic spline to approximate f(x) = e^ -x , by using values for x = 0 , 0.25, 0.75, 1
    now i know i have to contstruct something like this
    [tex] ss_{j} = a_{j} + b_{j} (x - x_{j}) + c_{j} (x-x_{j})^2 + d_{j} (x- x_{j})^3 [/tex]
    also we know from the initial conditions that a0 = f(0), but im not sure what to do after this...

    I have to do this for each interval and in all there will be three splines (cubic polynomials) But i cannot find any of the a,b,c, or d s. My textbook doesnt help either... i wouldnt be asking this if it gave a good xample showing how it got the answer rather than show me a code for maple to find this! Perhaps you could direct me to a website that ilustrates how to a1,b1,c1, and so on ...
    YOur hlep would be greatlly apprcietaetd since my exam is in about 5 hours... I

    And yes i know this is last minute but i have consulted numerous books and all of that searhin ahs yielded nothing or use.

    Please help
  2. jcsd
  3. Dec 12, 2005 #2


    Staff: Mentor

    Last edited by a moderator: Apr 21, 2017
Share this great discussion with others via Reddit, Google+, Twitter, or Facebook