[R] plot pch

[Joris De Wolf]

Somebody will come up with a more elagant solution, but a quick fix 
would be:

plot(df$Y[df$pch_type != "21"],df$X[df$pch_type != "21"], 
pch=df$pch_type[df$pch_type != "21"])
points(df$Y[df$pch_type == "21"],df$X[df$pch_type == "21"],pch= 21)



Marc Bernard wrote:
> Dear All,
>    
>   I  have a data as follows:
>    
>   ID <- 1:100
>   Y <- rnorm(100)
>   X <- rnorm(100)
>   type <- as.factor(rep(1:3,100,time=1))
>   df <- as.data.frame(cbind(ID, Y,X,type))
>    
>   I want to plot Y versus X  by specifying the pch to be as follows:
>    
>   Subjects having type = 1 must be plotted with a character pch =  "A"
>   Subjects having type = 2 must be plotted with a pch =  "B"
>   Subjects having type = 3 must be plotted with a pch =  21
>    
>   I used the follwomg:
>    
>   df$pch_type = recode(df$type, "1 = 'A'; 2 = 'B'; else = '21' " )
>   plot(df$Y,df$X,pch= df$pch_type)
>   This  plots subjects for type 1 and 2 with  symbols A and B (this is what expected) however subjects with type = 3 are plotted with a charcater 2 instead of a pch=21. I understand that this is due to the fact that the created vector "type_pch" cannot be a mixture between characters and numerics ... I tried to use a list for that purpsoe but fail...
>    
>   Any suggestions would be grateful,
>    
>   Many thanks,
>    
>   Bernard 
>    
>     
>     
> 
>  		
> ---------------------------------
> 
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> 
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-- 

======================================================================
Joris De Wolf
CropDesign N.V.
Biometrician Plant Evaluation
Technologiepark 3
B-9052 Zwijnaarde
Belgium
Tel. : +32 9 242 91 55
Fax  : +32 9 241 91 73
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