[R] How to create 10 minute time series from hourly data

[PIKAL Petr]

Hi

You maybe could try

?splinefun or ?approxfun

Cheers
Petr

> -----Original Message-----
> From: R-help [mailto:r-help-bounces at r-project.org] On Behalf Of Mary Ann
> Middleton
> Sent: Wednesday, February 1, 2017 5:42 PM
> To: r-help at r-project.org
> Subject: [R] How to create 10 minute time series from hourly data
>
> Hello,
>
> Apologies if this is a duplicate. I think I sent it to the wrong list yesterday.
>
> I would appreciate some direction/suggestions with a problem with a time
> series.
>
> I have a regular time series dataframe with hourly data. I need to create a
> time series with a 10 minute interval for $Level_m to compare to another
> time series.
>
> I would like to apply an approximation and create a time series with 10
> minute intervals from the data series I have. I do not want to smooth the
> data and so I think a linear approximation would suffice.
>
> I have also searched xts for possible solutions but haven't had luck. Any input
> is greatly appreciated.
>
> ~Mary Ann Middleton, PhD
>
>
>
>
> Here is a sample of the data I have:
>
> Date Time date.time ms LEVEL TEMPERATURE Level_m
> 1 2016-05-31 15:25:00 2016-05-31 15:25:00 0 92.1767 25.171 9.401814
> 2 2016-05-31 16:25:00 2016-05-31 16:25:00 0 92.1498 18.023 9.399071
> 3 2016-05-31 17:25:00 2016-05-31 17:25:00 0 92.0781 17.951 9.391757
> 4 2016-05-31 18:25:00 2016-05-31 18:25:00 0 92.0664 16.312 9.390564
> 5 2016-05-31 19:25:00 2016-05-31 19:25:00 0 92.0250 15.043 9.386341
> 6 2016-05-31 20:25:00 2016-05-31 20:25:00 0 91.9732 14.015 9.381058
>
> Here is the str()
>
> 'data.frame': 164 obs. of 7 variables:
> $ Date : chr " 2016-05-31 " " 2016-05-31 " " 2016-05-31 " " 2016-05-31 " ...
> $ Time : chr "15:25:00" "16:25:00" "17:25:00" "18:25:00" ...
> $ date.time : POSIXct, format: " 2016-05-31 15:25:00" " 2016-05-31 16:25:00" ...
> $ ms : int 0 0 0 0 0 0 0 0 0 0 ...
> $ LEVEL : num 92.2 92.1 92.1 92.1 92 ...
> $ TEMPERATURE: num 25.2 18 18 16.3 15 ...
> $ Level_m : num 9.4 9.4 9.39 9.39 9.39 ...
>
>       [[alternative HTML version deleted]]
>
> ______________________________________________
> R-help at r-project.org mailing list -- To UNSUBSCRIBE and more, see
> https://stat.ethz.ch/mailman/listinfo/r-help
> PLEASE do read the posting guide http://www.R-project.org/posting-
> guide.html
> and provide commented, minimal, self-contained, reproducible code.

________________________________
Tento e-mail a jakékoliv k němu připojené dokumenty jsou důvěrné a jsou určeny pouze jeho adresátům.
Jestliže jste obdržel(a) tento e-mail omylem, informujte laskavě neprodleně jeho odesílatele. Obsah tohoto emailu i s přílohami a jeho kopie vymažte ze svého systému.
Nejste-li zamýšleným adresátem tohoto emailu, nejste oprávněni tento email jakkoliv užívat, rozšiřovat, kopírovat či zveřejňovat.
Odesílatel e-mailu neodpovídá za eventuální škodu způsobenou modifikacemi či zpožděním přenosu e-mailu.

V případě, že je tento e-mail součástí obchodního jednání:
- vyhrazuje si odesílatel právo ukončit kdykoliv jednání o uzavření smlouvy, a to z jakéhokoliv důvodu i bez uvedení důvodu.
- a obsahuje-li nabídku, je adresát oprávněn nabídku bezodkladně přijmout; Odesílatel tohoto e-mailu (nabídky) vylučuje přijetí nabídky ze strany příjemce s dodatkem či odchylkou.
- trvá odesílatel na tom, že příslušná smlouva je uzavřena teprve výslovným dosažením shody na všech jejích náležitostech.
- odesílatel tohoto emailu informuje, že není oprávněn uzavírat za společnost žádné smlouvy s výjimkou případů, kdy k tomu byl písemně zmocněn nebo písemně pověřen a takové pověření nebo plná moc byly adresátovi tohoto emailu případně osobě, kterou adresát zastupuje, předloženy nebo jejich existence je adresátovi či osobě jím zastoupené známá.

This e-mail and any documents attached to it may be confidential and are intended only for its intended recipients.
If you received this e-mail by mistake, please immediately inform its sender. Delete the contents of this e-mail with all attachments and its copies from your system.
If you are not the intended recipient of this e-mail, you are not authorized to use, disseminate, copy or disclose this e-mail in any manner.
The sender of this e-mail shall not be liable for any possible damage caused by modifications of the e-mail or by delay with transfer of the email.

In case that this e-mail forms part of business dealings:
- the sender reserves the right to end negotiations about entering into a contract in any time, for any reason, and without stating any reasoning.
- if the e-mail contains an offer, the recipient is entitled to immediately accept such offer; The sender of this e-mail (offer) excludes any acceptance of the offer on the part of the recipient containing any amendment or variation.
- the sender insists on that the respective contract is concluded only upon an express mutual agreement on all its aspects.
- the sender of this e-mail informs that he/she is not authorized to enter into any contracts on behalf of the company except for cases in which he/she is expressly authorized to do so in writing, and such authorization or power of attorney is submitted to the recipient or the person represented by the recipient, or the existence of such authorization is known to the recipient of the person represented by the recipient.