Built-in function diff - methodology

3 次查看（过去 30 天）
Dessislava Koleva
Hi,
What methodology is used in "diff"? Does it take forward or central differences, and what is the step? How can I check the source code?
Thanks in advance!

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采纳的回答

Jonathan Sullivan
help diff
doc diff

更多回答（2 个）

Jan
Jan 2012-4-3
You cannot check the code of DIFF, because it is a built-in function. As Jonathan has said already, reading the doc will reveal the internal method. It is the difference of subsequent elements.
Dessislava Koleva
Thank you for the fast responses, I guess I'll need something else for my evaluation then. Have a good day!
  2 个评论
Jan
Jan 2012-4-3
I guess you are looking for GRADIENT.
Dessislava Koleva
Dessislava Koleva 2012-4-3
I'll check it out, yes. I was interested in the order of the error, as I'm getting slightly different numbers from those obtained by a closed form solution. (slightly = 0.002, which is a lot, in my opinion). However, thanks for the answer!

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