r - Convert a data read in by fread function to data.frame -

assume have sample csv file has 3 rows , 4 columns. looks following:

name1 name2  name3 name4 11    12     13    14 21    22     23    24 31    32     33    34 

i read in using fread() (i using small sample illustration purpose):

data <- fread(sample.csv, stringsasfactors=false) 

then

class(data) 

it return

[1] "data.table" "data.frame" 

i want see first element of fourth column, tried

data[1,4] 

but returns 4 (which guess index of column).

interestingly, when call following

data[1,]  

or

data[1] 

it returns first row.

so did

data <- data.frame(data) 

to convert data data frame.

my questions:
1. since initial data has 2 classes, there way me choose 1 class , 'drop' other? in case, want use data data frame.
2. in general, if data has more 1 class, may choose 1 class keep? instance, as.posixct() return object 2 classes ("posixct" "posixt"). if want keep 1 of classes? function works purpose in generic way?

if want use fread , want data data frame set property of data.table false. default true.

a data.table default. data.frame when argument data.table=false;

e.g.

options(datatable.fread.datatable=false). 

see documentation of r fread reference. https://www.rdocumentation.org/packages/data.table/versions/1.10.4-2/topics/fread