Le 11 février 2012 02:33, David Winsemius <dwinsemius@comcast.net> a écrit :

>
> On Feb 10, 2012, at 7:05 PM, Adel ESSAFI wrote:
>
>  Hi list
>>
>>
>> I  need some help for drawing some histograms
>>
>> I have a dataframe , say,
>> X Y Z T
>>
>> I want to draw a histogram Z-T for each value of the couple (X-Y).
>> When I use thus syntax
>>
>>  library(lattice)
>>> histogram(law[,3] ~ law[,66] | law[,1] )
>>>
>>
> Perhaps (but untested in the absence of data);
>
>  histogram( Z ~ T | interaction(X, Y)  , data=dfrmname )
>
> Thanks ,
that helped a lot.

now, I have another problem: I want  to draw many (two) figures together.
The par(new=T) directve does not recognize the ploy provided by lattice
library
when I tired :
> xyplot(law[,66] ~ law[,3]| interaction(law[,1],law[,2]),type='l')
> par(new=T)
*Warning message:
In par(new = T) : calling par(new=TRUE) with no plot*
> xyplot(law[,67] ~ law[,3]| interaction(law[,1],law[,2]),type='l')

and the second xyplot() draws a new figure.

what can I do to draw to figures together using lattice?
Thanks







>
>
>> it draws multiple histograms but by selecting distinct values of  law[,1]
>> The deal is to make the same thing but for a couple of columns
>>
>> Thanks in advance for help
>>
>> Adel
>>
>>
> --
>
> David Winsemius, MD
> West Hartford, CT
>
>


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