R: Given column name in a Data Frame, Get the Index

February 17, 2011

(This article was first published on Getting Genetics Done, and kindly contributed to R-bloggers)

Had a mental block today trying to figure out how to get the indices of columns in a data frame given their names. Simple task but difficult to search Google for an answer. Thanks to jashapiro, Matt, and Vince for giving me a heads up on the which() function. The which() function returns the indices of TRUE values in a logical vector.

If you’re looking at the iris data:


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