[R] datetime on x-axis of plot

[Don MacQueen]

Is the date part of your data a POSIXct object?

If so,

   plot( myData[,1], myData[,2] )

will label the x axis with dates.

See the help pages for date-time class objects:
   ?POSIXt

(POSIXt includes both POSIXct and POSIXlt; I tend to prefer POSIXct 
and find it the easier of the two to work with, overall)

-Don

At 1:04 PM -0800 2/28/08, joshv wrote:
>Hello, I'm reading Time Series Analysis and its Applilcations with R Examples
>and I have a question...
>
>I notice that in the book there are timeseries plots but without the x-axis
>being labeled with dates.  They are just numbers 1,...50,...100, etc.  How
>do I get the date to show up on the x-axis?
>
>Here is my dateframe:
>
>>  head(myData, 5)
>                   
>1 2008-01-30 08:30   7.00
>2 2008-01-30 08:32   9.25
>3 2008-01-30 08:34   5.50
>4 2008-01-30 08:36   5.00
>5 2008-01-30 08:38 -26.25
>
>(Also, I have searched using Rseek.org and not found anything to help me.
>Any searching advice would be greatly appreciated.)
>
>--
>View this message in context: 
>http://www.nabble.com/datetime-on-x-axis-of-plot-tp15745910p15745910.html
>Sent from the R help mailing list archive at Nabble.com.
>
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-- 
--------------------------------------
Don MacQueen
Environmental Protection Department
Lawrence Livermore National Laboratory
Livermore, CA, USA
925-423-1062