R data.frame integer column convert NA -

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i have data below in csv file. read data data.frame in r using read.csv command

my play2 column after import has values (7,na, na,na etc) want convert nas blanks @ same time maintain column integer column

how that?

time_s  it_rms  play    play2   play3 0   0.744608402 #   7   abc 60  1.540045857 @   na  na 120 2.217387915 1       ! null    *   2            5.052185059          216 13.14362144          ^   7.940382004          298 9.155433655          na               nan              4                5

i tried below code. final_data_file name of data.frame had data, changed datatype of column :(

 final_data_file$play2[is.na(final_data_file$play2)]=""  final_data_file$play2[is.na(final_data_file$play2)]

character(0)


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