Create column inside a loop in R

Asked Jul 19 '17 at 00:07

Active Jul 19 '17 at 00:15

Viewed 18 times

I have this data.

OPENING
2007
2009
2004

I want to make the column format like this:

OPENING Y2004 Y2005 Y2006 Y2007 Y2008 Y2009
2007                        1    
2009                                    1
2004      1

It is possible to create this column step by step with if function, while I'd like to make loop or lapply function.

How do I use these functions?

edited Jul 19 '17 at 00:15

Gregor Thomas

asked Jul 19 '17 at 00:07

jhyeon

This are called "dummy variables" or "one-hot encoding". If you search those terms you will find plenty of examples. – Gregor Thomas Jul 19 '17 at 00:14
Thanks for the comment! – jhyeon Jul 19 '17 at 00:21

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