R help - Jul 2010 - How do I plat timestamed (in seconds) data in R?

Hi all,

I have an Nx2 array, where the first column contains the timestamps and the
second column contains the corresponding data.

second  | ts
--------| --
14:25:00| 18
14:25:02| 14
14:25:04| 11
14:25:06| 4
14:25:08| 24
14:25:10| 13
14:25:12| 12
14:25:14| 6
14:25:16| 21
14:25:18| 37
14:25:20| 21
14:25:22| 9

Since I don't know how to do this in R yet, please allow me to show data in
Matlab:

In Matlab, the first column becomes:


   0.600694444496185
   0.600752314785495
   0.600810185191222
   0.600868055596948
   0.600925925886258
   0.600983796291985
   0.601041666697711
   0.601099536987022
   0.601157407392748

How do I plot such data with X-axis showing the timestamps (seconds) and the
Y-axis showing the data?

Thanks a lot!
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On Jul 6, 2010, at 8:58 AM, LosemindL wrote:
>
> Hi all,
>
> I have an Nx2 array, where the first column contains the timestamps  
> and the
> second column contains the corresponding data.
>
> second  | ts
> --------| --
> 14:25:00| 18
> 14:25:02| 14
> 14:25:04| 11
> 14:25:06| 4
> 14:25:08| 24
> 14:25:10| 13
> 14:25:12| 12
> 14:25:14| 6
> 14:25:16| 21
> 14:25:18| 37
> 14:25:20| 21
> 14:25:22| 9
>
> Since I don't know how to do this in R yet, please allow me to show  
> data in
> Matlab:
 > tz <- read.table(textConnection("second  | ts
+ 14:25:00| 18
+ 14:25:02| 14
+ 14:25:04| 11
+ 14:25:06| 4
+ 14:25:08| 24
+ 14:25:10| 13
+ 14:25:12| 12
+ 14:25:14| 6
+ 14:25:16| 21
+ 14:25:18| 37
+ 14:25:20| 21
+ 14:25:22| 9"), header=TRUE, sep="|")
>
> In Matlab, the first column becomes:
>
>
>   0.600694444496185
>   0.600752314785495
>   0.600810185191222
>   0.600868055596948
>   0.600925925886258
>   0.600983796291985
>   0.601041666697711
>   0.601099536987022
>   0.601157407392748
>
> How do I plot such data with X-axis showing the timestamps (seconds)  
> and the
> Y-axis showing the data?
>
 > plot (zoo(tz[,2], order.by=tz[,1])  )

-- 
David Winsemius, MD
West Hartford, CT

On Tue, Jul 6, 2010 at 8:58 AM, LosemindL <comtech.usa at gmail.com>
wrote:
>
> Hi all,
>
> I have an Nx2 array, where the first column contains the timestamps and the
> second column contains the corresponding data.
>
> second ?| ts
> --------| --
> 14:25:00| 18
> 14:25:02| 14
> 14:25:04| 11
> 14:25:06| 4
> 14:25:08| 24
> 14:25:10| 13
> 14:25:12| 12
> 14:25:14| 6
> 14:25:16| 21
> 14:25:18| 37
> 14:25:20| 21
> 14:25:22| 9
>
> How do I plot such data with X-axis showing the timestamps (seconds) and
the
> Y-axis showing the data?
>
Try this (and see the three vignettes, i.e. pdf documents, that come
with zoo, the zoo help files and the article on dates and times in R
News 4/1):

Lines <- "second  | ts
14:25:00| 18
14:25:02| 14
14:25:04| 11
14:25:06| 4
14:25:08| 24
14:25:10| 13
14:25:12| 12
14:25:14| 6
14:25:16| 21
14:25:18| 37
14:25:20| 21
14:25:22| 9"

library(zoo)
library(chron)
z <- read.zoo(textConnection(Lines), header = TRUE, sep = "|", FUN
= times)
plot(z, type = "o") # overplot points and lines