R help - Feb 2008 - storing ggplot objects as components of a vector

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Gallego Liberman, Matias wrote:
> Hi.
>  
> I have a lot of plots that i need to store as components of a vector.
> Here you have an example
>  
>> DF<-data.frame(A=rnorm(12),B=c(1:12),C=rep(c(1:4),each=3))
>> Q<-c()
>> length(Q)<-3
You need a list, hence replace the last two lines by:

Q <- vector(mode="list", length=2)

>> PAC<-geom_point(mapping=aes(x=A,y=B),data=DF[DF$C==1,])
>> P<-ggplot()+PAC
>> P #generates the plot
>> Q[1]<-P
and here replace last line by:

Q[[1]]<-P

Best,
Uwe Ligges

> Warning message:
> In Q[1] <- P :
>   n?mero de items para para sustituir no es un m?ltiplo de la longitud del
reemplazo
>> Q[1]
> [[1]]
> NULL
>  
>  
> I guess the problem is the class of Q[1]. 
> if so, what class should I coerce Q to for the sentence: > Q[1] to
generate the plot as > P does?
>  
> thanks in advance
> 
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> 
> 
> 
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You'll need to store it in a list rather than a vector.

library(ggplot2)
DF<-data.frame(A=rnorm(12),B=c(1:12),C=rep(c(1:4),each=3))
Q <- list()
PAC<-geom_point(mapping=aes(x=A,y=B),data=DF[DF$C==1,])
P<-ggplot()+PAC
Q[[length(Q) + 1]] <- P
Q[[1]]

You could shorten this into

library(ggplot2)
DF<-data.frame(A=rnorm(12),B=c(1:12),C=rep(c(1:4),each=3))
Q <- list()
Q[[length(Q) + 1]] <- ggplot(DF[DF$C==1,], aes(x=A,y=B)) + geom_point()
Q[[1]] 

HTH,

Thierry

----------------------------------------------------------------------------
ir. Thierry Onkelinx
Instituut voor natuur- en bosonderzoek / Research Institute for Nature and
Forest
Cel biometrie, methodologie en kwaliteitszorg / Section biometrics, methodology
and quality assurance
Gaverstraat 4
9500 Geraardsbergen
Belgium 
tel. + 32 54/436 185
Thierry.Onkelinx op inbo.be 
www.inbo.be 

Do not put your faith in what statistics say until you have carefully considered
what they do not say.  ~William W. Watt
A statistical analysis, properly conducted, is a delicate dissection of
uncertainties, a surgery of suppositions. ~M.J.Moroney

-----Oorspronkelijk bericht-----
Van: r-help-bounces op r-project.org [mailto:r-help-bounces op r-project.org]
Namens Gallego Liberman, Matias
Verzonden: vrijdag 15 februari 2008 10:09
Aan: r-help op r-project.org
Onderwerp: [R] storing ggplot objects as components of a vector

Hi.

I have a lot of plots that i need to store as components of a vector.
Here you have an example
> DF<-data.frame(A=rnorm(12),B=c(1:12),C=rep(c(1:4),each=3))
> Q<-c()
> length(Q)<-3
> PAC<-geom_point(mapping=aes(x=A,y=B),data=DF[DF$C==1,])
> P<-ggplot()+PAC
> P #generates the plot
> Q[1]<-P
Warning message:
In Q[1] <- P :
  n?mero de items para para sustituir no es un m?ltiplo de la longitud del
reemplazo
> Q[1]
[[1]]
NULL


I guess the problem is the class of Q[1]. 
if so, what class should I coerce Q to for the sentence: > Q[1] to generate
the plot as > P does?

thanks in advance

	[[alternative HTML version deleted]]