And for those that follow you. Neither the first nor second derivative is a particularly good indicator of peaks and troughs. At least not in this data.

In this graph, red is the original data; green the first derivative and blue the second.

Note that the green lines inflection points don't track the reds in anyway.

The second derivative has inflections corresponding to those in the data. But it also "invents" new ones where they do not exist.

And can anyone automate the determination of which of the 5 or 6 reversals in the last segment of the blue line corresponds to the highest peak in the original data?

With the rise and rise of 'Social' network sites: 'Computers are making people easier to use everyday'
Examine what is said, not who speaks -- Silence betokens consent -- Love the truth but pardon error.
"Science is about questioning the status quo. Questioning authority".
In the absence of evidence, opinion is indistinguishable from prejudice.

The start of some sanity?

In reply to Re^5: Any idea for predicting the peak points in the graph by perl by BrowserUk
in thread Any idea for predicting the peak points in the graph by perl by Anonymous Monk

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