Question re importing csv data into R

I created an excel file that contain one column of data and saved as a csv

then I used

m <- read.csv("myfile.csv')

the data is imported but when I do

hist(m) it says data is not numeric

however when I do

m<-m[,1]

then hist(m) works !

any idea why? How do I import a csv without having to perform m<-m[,1] ??

Thanks