r plotting multiple columns in df through a loop

Question

a<-c(1,2,3,4) 
b<-c(1,2,3,4) 
c<-c(2,3,4,5)
f<-c(5,6,7,8)
p<-c(3,7,6,5)
df = data.frame(a,b,c,f,p)

for (i in c('c','f','p'))
    plot(df$a, df$i)

I am trying to use a loop to plot some columns of a df but df$columnName does not appear to select the correct columns.

I have also tried plot(a~i, df) and it does not work also. Please help!

Do you need matplot('colnames<-'(t(df[-1]), df$a), type = 'l') — akrun
– akrun, Commented Nov 27, 2018 at 3:43

Brandon Nedwek · Accepted Answer · 2018-11-27 03:59:52Z

1

I don't think you can use the df$ style of indexing for some variable that holds a string. If you switch to square brackets for column indexing (making sure not to forget the empty row index to select all rows) then you can use a variable holding a column name.

The following works to make three plots of the variables in your vector:

par(mfrow=c(3,1))
for (i in c('c','f','p'))
    plot(df[,'a'], df[,i])

answered Nov 27, 2018 at 3:59

Brandon Nedwek

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