Thanks Richard and Jim for your reply!

@All:

Is there a way to do this without altering default x-labels (because in my
case there could be up to 30-40 x-labels and I may have to repeat the script
multiple times with different x-lables).

OR, not sure but can it be done by extending plotting region parameters for
lattice plots (though I'm aware of how to change these).

Thanks,
Peng Cai

On Wed, Mar 17, 2010 at 7:27 PM, Jim Lemon <jim@bitwrit.com.au> wrote:

>  On 03/18/2010 09:50 AM, Peng Cai wrote:
>
>> Hi All,
>>
>> I need some help with adding text at the bottom of the graph (outside of
>> default outline of graph).
>>
>> Say, I need to write "Month:   01     04" below each of the two years in
>> the
>> following R code, something like this:
>>
>>           _______________
>>           |                         |
>>           |         Plot          |
>>           |___  __________|
>>            1931          1932
>> Month:   01              04
>>
>> # R code
>> require(lattice)
>> barchart(yield ~ year, data = barley,
>>   stack=TRUE,
>>   col="black",
>>   ylim=c(0,85)
>> )
>>
>
> Hi Peng,
> Try using mtext:
>
> mtext("Month:  01   04",side=1,line=2,at=0,adj=0)
>
> You may have to adjust the last three arguments to get it in the correct
> position.
>
> Jim
>
>

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