I wanna display some data which there are subsets of a dataframe called "don" but there are errors like this

> L=as.numeric(levels(factor(don$Id_Cara)))
> for(i in L){
+ donC(i)=subset(don, Id_Cara == i, select = c( Id_TrT1, Id_Geno, Id_Rep, Val_O))
+ donC(i)
+ }
Erreur dans donC(i) = subset(don, Id_Cara == i, select = c(Id_TrT1, Id_Geno,  : 
        impossible de trouver la fonction "donC<-"

I understand that the problem comes from the third line 

it doesn't reconize "donC(i)" but  it's very important to make one "boucle" (in french) on the L's elements.

to tell more about L :

> L
[1] 103 137 138 177 193 308


      
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