Hello R users



I recently learned how to use this command:


lapply(datum,"[[","ColumnName")

 

Unfortunately, I don't know how exactly it works, what it's called (in
particular the "[[" part], and what other things you can do with it
(retrieve multiple columns?).


Given datum is a list of dataframes with the same column, but different
number of rows,

 

lapply(datum,"[[","ColumnName"),

 

Returns you a list of a particular column form each of your dataframes from
datum.

 

I think this is a really useful command, and would like to learn more about
it.
Unfortunately I don't know what subject or topic it is under and cannot look
it up in a book.

 

Thank you,

 

Kevin

 

Master of Science Student

Department of Food, Resource and Agricultural Economics

University of Guelph
Office:    519-824-4120 ext. 58528

Mobile:  226-979-2813

 <http://fare.uoguelph.ca/users/kchang01>
http://fare.uoguelph.ca/users/kchang01 



 


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