Thanks Mr.Winsemius for the proposed solution ,it worked fine.But when came
to the entire data frame containing 400000 rows ,i used the following code
as proposed by you
a$date1<-gsub("/","-",a$date)
got the following error:
Error in `$<-.data.frame`(`*tmp*`, "date1", value = character(0)) :
replacement has 0 rows, data has 441906
Please provide solution with the problem.
Thanks.
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