[R] Dateticks

[james.holtman@convergys.com]

try this example:

> x.1 <- strptime("6/17/03",'%m/%d/%y')
> x.1
[1] "2003-06-17"
> plot(0:250, xaxt='n')
> dates <- x.1 + c(0,50,100,150,200,250) * 86400  # 'dates' is in seconds,
so add the appropriate number of days
> dates
[1] "2003-06-17 00:00:00 EDT" "2003-08-06 00:00:00 EDT" "2003-09-25
00:00:00 EDT"
[4] "2003-11-13 23:00:00 EST" "2004-01-02 23:00:00 EST" "2004-02-21
23:00:00 EST"
> axis(1, at=c(0,50,100,150,200,250), labels=format(dates,"%m/%d/%y"))  #
format the output
>

Jim
__________________________________________________________
James Holtman        "What is the problem you are trying to solve?"
Executive Technical Consultant  --  Convergys Labs
james.holtman at convergys.com
+1 (513) 723-2929


                                                                                                                                           
                      "Bernard L. Dillard"                                                                                                 
                      <bld at math.umd.edu>           To:       r-help at stat.math.ethz.ch                                                      
                      Sent by:                     cc:                                                                                     
                      r-help-bounces at stat.m        Subject:  [R] Dateticks                                                                 
                      ath.ethz.ch                                                                                                          
                                                                                                                                           
                                                                                                                                           
                      06/14/2005 12:27                                                                                                     
                                                                                                                                           




Hello.  I am having the worst time converting x-axis date ticks to real
dates.  I have tried several suggestions in online help tips and books to
no avail.

For example, the x-axis has 0, 50, 100, etc, and I want it to have
"6/17/03", "8/6/03" etc.  See attached (sample).

Can anybody help me with this.

Here's my code:

ts.plot(date.attackmode.table[,1], type="l", col="blue", lty=2,ylab="IED
     Attacks", lwd=2,xlab="Attack Dates",main="Daily Summary of Attack
     Mode")
grid()

Thanks for your help if possible.
(See attached file: sample.pdf)
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