[R] Identifying columns with specific character

[Farnoosh Sheikhi]

Hello,
I have a data frame with 400 columns and wanted to filter character columns with "$" in it.For example: >  x <- c("$5", "$89", "$10", "$34")  >  y <- c(1:4)>  My.Data <- data.frame (x,y)> My.Data    x y1  $5 12 $89 23 $10 34 $34 4
I want to detect the columns with $ and remove the $ from the selected columns.I have tried apply(My.Data, 2, function (x) any(grepl("$", x))) but it's not really working.Or:  apply(My.Data, 2, function(x){x<-gsub("\\$", "", x)}) works but it turns all the columns to a factor.
Thanks.
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