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bonus
Joined: 07 Sep 2011
Posts: 2
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 Posted: Wed Sep 07, 2011 10:24 am Post subject: Differentiate curve based on past time interval |
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Is there a way to differentiate a curve based on the past = previous time interval?
| Code: | | y_j' = (y_j - y_j-1)/(x_j - x_j-1) |
I'm working with non equally spaced rainfall time series, here in the form of the total rainfall depth:
| Code: | 26-05-2011 17:28:19 0.1
26-05-2011 17:35:42 0.2
26-05-2011 20:27:53 0.3
26-05-2011 22:36:41 0.4
26-05-2011 22:39:16 0.5
26-05-2011 22:44:05 0.6
26-05-2011 22:51:35 0.7
26-05-2011 22:53:43 0.8
26-05-2011 22:56:56 0.9
26-05-2011 23:00:07 1.0
26-05-2011 23:02:31 1.1
26-05-2011 23:03:39 1.2
etc. |
The rainfall intensity equals the slope of the rainfall depth in the past interval, whereas the "Differentiate a Curve" command is based on the central difference
| Code: | | y_j' = (y_j+1 - y_j-1)/(x_j+1 - x_j-1) |
which doesn't really fit.
Thank you! |
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DPlotAdmin
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Joined: 24 Jun 2003
Posts: 2311
Location: Vicksburg, Mississippi
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| Posted: Wed Sep 07, 2011 12:13 pm Post subject: |
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There's no way to do that but it would of course be an easy addition. Thanks for the suggestion.
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bonus
Joined: 07 Sep 2011
Posts: 2
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| Posted: Thu Sep 29, 2011 9:44 am Post subject: |
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If this is indeed an easy addition, it would be great to get it in one of the next releases.
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DPlotAdmin
Site Admin
Joined: 24 Jun 2003
Posts: 2311
Location: Vicksburg, Mississippi
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| Posted: Thu Sep 29, 2011 10:38 am Post subject: |
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It will be.
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raswaim
Joined: 06 Jan 2005
Posts: 69
Location: Houston, TX
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| Posted: Sat Mar 17, 2012 7:10 pm Post subject: |
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Is this feature restricted to only curves that have regular intervals? With the latest release I seem to only get the pop-up to choose the method if the data is regular. I differentiated a sample generated curve and got the popup, but after I remove a couple points from the curve I no longer get any options when I select the same curve to differentiate again.
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DPlotAdmin
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Joined: 24 Jun 2003
Posts: 2311
Location: Vicksburg, Mississippi
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| Posted: Sat Mar 17, 2012 7:14 pm Post subject: |
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Yes, but that is an error of omission on my part rather than a logical restriction. I'll fix this in the next release.
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