Hello people,

I would like to know how can I use a list of variables (a char list) to have access to the collums from a dataframe to be used in some analysis like, just as example, a ploting task on a "for()" loop. Of course the code below is just to understand the way. In this example I have a dataframe with several collumns (more then fifty in my case) and I would like do use only some of them. I really need use a "var.list"! 

a<-seq(1,100,1)
b<-c(rep(c(1,2,3,4,5),20))
c<-rnorm(100,0,1)
d<-runif(100,0,1)
e<-c^2
f<-c/d
g<-c-d
df<-data.frame(cbind(a,b,c,d,e,f,g))
var.list<-c("c","f","g")
for (myvar in var.list) 
 {
 plot(density(df$myvar))   # here I need recover df$c , df$f and df$g
 }

Kind regards
Miltinho 
Brazil

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