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Finite DIfferences (easy)

  1. Jul 13, 2015 #1

    joshmccraney

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    Gold Member

    Hi PF!

    I am looking at finite differencing schemes and it seems we need more initial information to compute central finite differencing than forward finite differencing. Is this true, or am I understanding the process wrong?

    Thanks!
     
  2. jcsd
  3. Jul 15, 2015 #2
    In either case, you need three numbers, the values at two points and the distance between them. I don't see much difference between
    ##\frac{y_{n+1} - y_n}{\Delta x}##
    ##\frac{y_{n+1/2} - y_{n-1/2}}{\Delta x}##
     
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