[R] Line plot with date-time on X-axis

[Malladi, Sukhaswami]

Dear dr.Sarkar,

Thanks for your response. My dates are already formatted. 
I was having problems to display them as X-axis tick labels. 
I was searching the archives and found axis() to be relevant.
I played with its parameters a little and got what I wanted :-

If V1 is a list of Dates, V2 list of Times, V3 list of
Temperatures,

vx <- as.character(paste(V1,V2,sep=" "))
plot(V3,main="Temperature plot",xlab="",xaxt="n",
	type="o", ylab="Temp. in Deg.") 
axis(1,1:length(vx),labels=vx,cex.axis=0.6,las=2)

Thanks again
sukhaswami 

-----Original Message-----
From: Deepayan Sarkar [mailto:deepayan at stat.wisc.edu]
Sent: Friday, November 01, 2002 5:58 PM
To: Malladi, Sukhaswami; r-help at stat.math.ethz.ch
Subject: Re: [R] Line plot with date-time on X-axis


On Friday 01 November 2002 02:24 pm, Malladi, Sukhaswami wrote:
> Dear List,
>
> What is the way in R to plot a graph having date time (e.g. format
> 12/31/2002 13:12) in the
> x axis and numerical value (e.g. temperature) on the Y-axis ?

If you have your dates as strings, you need to use strptime() to convert
that 
into date-time objects first.


> I could not get 'plot()' to do this as X axis values are non-numeric.
> 'bwplot()' sorts the date
> values and thereby changes the order of the dates and of Y. The date/time
> values have to be
> shown on the X-axis as tick values rotated by 90 deg. as there more than
> 100 points.
>
> I appreciate your suggestions and hints.
>
> Thanks
> sukhaswami
> Lexicon Genetics
>
>
>
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