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How to interpolate between asynchronous data samples?|General Excel Questions & Answers|Excel Forum|My Online Training Hub

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sp_CrumbsHome HomeExcel ForumGeneral Excel Questions & Answe…How to interpolate between asynchro…
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How to interpolate between asynchronous data samples?
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John Janssen

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June 29, 2018 - 8:42 am
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Hi experts,

I have a tough question (to me).

Introduction
From my Home Automation HC2, I imported CSV values from the internal temperature logging dataqbase into Excel 2013.
Column A = Unix time stamp, col. B = DeviceID, col. C = DeviceName, col. D = temperature in degrees Celsius.
Temperature sensors report new values asynchronously and are immediately stored in the HC2 logging database.
I separated the imported temperature value data to correponding columns per sensor, t_ambient, T1, T2, T3, T4,
created a Scatter Graph with Smooth Lines and set option to 'Connect data points with line'. See attached file.

Goal
I am interrested in the graphical result after subtracting t_ambient from T1 to T4.

Problem
As temperature values arrive asynchronously there are no full rows of data to subtract.
I need to fill the gaps (the cells marked yellow) by interpolated values. As there are hundreds of different gaps sizes,
manually contructing interpolatiion forrmulas is am impossible job.

Question
How use values when present and interpolate if absent in a generally easy to setup way (effectively filling the gaps)?

 

Best regards,
John

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Anders Sehlstedt
Eskilstuna, Sweden

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June 29, 2018 - 1:38 pm
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Hello John,

I think you might get a tip or two from this blog article (and from many others in this site), check it out and see if it gives you any useful tips.

https://www.myonlinetraininghu.....in-and-max

/Anders

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John Janssen

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June 29, 2018 - 6:12 pm
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Hi Anders,

Thank you for replying.
I checked the great blog you referred to but did not find anything to automatically interpolate random data gaps
I also checked this part of the forum up to page 20 before posting my question but found nothing that helped.

Cheers,
John

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