[R] Problems with graphics

[Christophe Nguyen]

Thank you for your response, which is a partial solution to my problem. 
Actually, I would like to do the following plot. I have a data frame 
that includes the following variables: time, y=a response variable 
experimentally determined, ystd=its standard deviation, m=the 
modeled/simulated values for y, and F a classification/grouping 
variable. I would like to have a treillis plot, each panel corresponding 
to a level of F and includes y plotted against time with dots as symbol 
and with bars for standard deviation using ystd and m superimposed , 
plotted as a line.
Thanks for your help,
Chris



Petr Pikal wrote:
> Hi
>
> Well, you did not specified what you have tried to do and how did you 
> fail but
>
> On 2 Oct 2006 at 16:41, Christophe Nguyen wrote:
>
> Date sent:      	Mon, 02 Oct 2006 16:41:29 +0200
> From:           	Christophe Nguyen <Christophe.Nguyen at bordeaux.inra.fr>
> To:             	r-help at stat.math.ethz.ch
> Subject:        	[R] Problems with graphics
>
>   
>> Dear all,
>> I am a SAS user, who's trying R. I am a little bit lost for graphics.
>> What is the simplest way for plotting y as a function of x with one
>> symbol (line or dot) for each level of a class variable z (for SAS
>>     
>
> If z is factor
> plot(x,y pch=as.numeric(z), ...)
>
> otherwise you need to change it to one.
>
> BTW, you can use the similar approach with lines and points - col, 
> lwd, cex,... and othe parameters.
>
>
>   
>> langage= plot x*y=z). Can I add vertical bars for standard deviation
>>     
>
> there are various options, one is to use arrows with angle=90.
>
> arrows(x,y,x, y+ystd, angle=90)
>
>   
>> stored in a  separate variable (say  ystd). Finally, is it possible to
>> do all this with xyplot function arranging plots according to A and B
>> factor: xyplot(y~x|A*B) with as many plots and symbol as there is
>>     
>
> that is completely different story and you probably need to elaborate 
> your own panel.function.
>
> HTH
> Petr
>
>   
>> levels in the z variable for each panel? Thanks for the help. Chris
>>
>> -- 
>> ___________________________________________________
>>
>> Christophe NGUYEN
>>
>> UMR 1220 INRA-ENITAB
>> Transfert sol-plante et cycle des éléments minéraux
>> dans les écosystčmes cultivés"
>>
>> Centre INRA de Bordeaux-Aquitaine
>> 71, avenue Edouard Bourlaux, BP 81
>> 33883 Villenave d'Ornon, FRANCE
>>
>> Tel : 00 33 (0)5 57 12 25 07
>> Fax : 00 33 (0)5 57 12 25 15
>>
>> email : Christophe.Nguyen at bordeaux.inra.fr
>> page infoservice: http://www.bordeaux.inra.fr/tcem
>>
>> __________m°O°m____________________________________
>>
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>>     
>
> Petr Pikal
> petr.pikal at precheza.cz
>
>
>
>
>
>   

-- 
___________________________________________________

Christophe NGUYEN

UMR 1220 INRA-ENITAB
Transfert sol-plante et cycle des éléments minéraux
dans les écosystèmes cultivés"

Centre INRA de Bordeaux-Aquitaine
71, avenue Edouard Bourlaux, BP 81
33883 Villenave d'Ornon, FRANCE

Tel : 00 33 (0)5 57 12 25 07
Fax : 00 33 (0)5 57 12 25 15

email : Christophe.Nguyen at bordeaux.inra.fr
page infoservice: http://www.bordeaux.inra.fr/tcem

__________m°O°m____________________________________