Displaying datatable column values in dollars in S

问题:

I have a datatable where one of the columns should be expressed in dollars and some as percentages. I've been looking around and I'm still not sure how to do it - seems like it would be easy?

The trickier part is I have another data table where only certain entries need to be expressed as dollars (i.e. not whole rows or whole columns) - is there a way to handle this?

回答1:

Imagine your datatable (myData) is 2 columns by 10 rows.

You want the second row to be in dollars:

myData[,2]<-sapply(myData[,2],function(x) paste0("$",x))

Or, you want rows 6 to 10 in the first column to be percentages:

myData[6:10,1]<-sapply(myData[6:10,1],function(x) paste0(x,"%"))

Or, you want rows 1 to 5 in the second column to be in dollars, you can do:

myData[1:5,2]<-sapply(myData[1:5,2],function(x) paste0("$",x))