[R] Reading csv file with missing value

[Steven Yen]

I read a csv file (with read.csv) containing missing values (as shown 
below). Is there a convenient way to set these NA into zeros?
Better yet, is there an option to assign zeros to these blank cells in 
reading the csv file? Thank you!

NA  -1  NA  NA  NA   1  NA
NA  NA  NA  NA  NA  NA  NA
NA  NA  NA  NA  NA  NA  NA
NA  -1  NA  NA  NA  NA  NA



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