[R] problems with plot.data.frame

[Berton Gunter]

You need to read R docs. Month is a factor. ?factor
As a result you are getting a bar plot. 
You can make month numeric and control axis labelling via ?axis
See also ?plot.default and ?par

There are also undoubtedly functions available either in base R or through
packages that would do this directly. You might check the hmisc and zoo
packages for starters.

-- Bert Gunter
Genentech Non-Clinical Statistics
South San Francisco, CA
 
"The business of the statistician is to catalyze the scientific learning
process."  - George E. P. Box
 
 

> -----Original Message-----
> From: r-help-bounces at stat.math.ethz.ch 
> [mailto:r-help-bounces at stat.math.ethz.ch] On Behalf Of Monica Pisica
> Sent: Thursday, August 31, 2006 9:30 AM
> To: r-help at stat.math.ethz.ch
> Subject: [R] problems with plot.data.frame
> Importance: High
> 
> Hi list,
> 
> I have a question about 'plot'. I am trying to plot values 
> registered every 
> month - or every other month. If i build a data.frame called 
> mydata like 
> this (as an example)
> 
> jan   3   1   7
> mar  2   4   2
> may 1   3   2
> jul    3   7   4
> sep  5   2   3
> nov  3   1   5
> 
> and use the command line:
> 
> plot(mydata[c(1,3)])
> 
> I get a graph that has on the x axis my months in 
> alphabetical order - which 
> i don't want, and instead of points i have thick horizontal 
> lines. I've 
> tried everything i could and understood from the R help files 
> to give me 
> points and on x axis the month in my order instead of alpha order. No 
> success. What is the trick?
> 
> I fixed the month order by using numerals in front of them 
> like 01, 03, ... 
> etc, but this is not an elegant solution.
> 
> Any help will be much appreciated.
> 
> Monica
> 
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