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Re: Forward & Center Derivative Approximation Breakdown
From: |
c. |
Subject: |
Re: Forward & Center Derivative Approximation Breakdown |
Date: |
Tue, 4 Feb 2014 08:32:22 +0100 |
On 4 Feb 2014, at 08:18, Javier <address@hidden> wrote:
> Hello all,
>
> Can anyone explain why my approximations break down at the iteration 15? Is
> this a memory issue? How does it really work?
> Thanks.
What do you mean by "break down"?
If you are surprised that your difference
formulas returns 0 for h = 1e-17 you shoud
read this:
http://docs.oracle.com/cd/E19957-01/806-3568/ncg_goldberg.html
or simply try any of the following:
(1 + 1e-17) == 1
(1 + eps) == 1
(1 + eps/2) == 1
HTH,
c.