You obviously have a clear picture in mind, which is hard to communicate verbally.

The easiest way to ask this question is to show us some sample plots, the associated data and your interpretation of "alikeness".

Either by ASCII graphic in a code section or by sharing a link to a freely hosted picture °


+     x
  * x +  etc
x   +

[download]

I already gave you the standard approach in mathematics, which is calculate the mean of squared differences.

You might tell us why this doesn't solve the problem.

Cheers Rolf
(addicted to the Perl Programming Language :)
see Wikisyntax for the Monastery

Update

°) Another possibility is sharing a Google doc spreadsheet including data and plotting

In reply to Re^2: Comparing graph shapes or soft matching. by LanX
in thread Comparing graph shapes or soft matching. by tweetiepooh

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