Dear all What is the easy way to drop a variable by using its name (and not its number)? Example: > data(iris) > head(iris) Sepal.Length Sepal.Width Petal.Length Petal.Width Species 1 5.1 3.5 1.4 0.2 setosa 2 4.9 3.0 1.4 0.2 setosa 3 4.7 3.2 1.3 0.2 setosa 4 4.6 3.1 1.5 0.2 setosa 5 5.0 3.6 1.4 0.2 setosa 6 5.4 3.9 1.7 0.4 setosa > head(iris[,-3]) Sepal.Length Sepal.Width Petal.Width Species 1 5.1 3.5 0.2 setosa 2 4.9 3.0 0.2 setosa 3 4.7 3.2 0.2 setosa 4 4.6 3.1 0.2 setosa 5 5.0 3.6 0.2 setosa 6 5.4 3.9 0.4 setosa > head(iris[,-which(names(iris)=="Petal.Length")]) Sepal.Length Sepal.Width Petal.Width Species 1 5.1 3.5 0.2 setosa 2 4.9 3.0 0.2 setosa 3 4.7 3.2 0.2 setosa 4 4.6 3.1 0.2 setosa 5 5.0 3.6 0.2 setosa 6 5.4 3.9 0.4 setosa > head(iris[,-"Petal.Length"]) Error in -"Petal.Length" : invalid argument to unary operator
Is there something more straight-forward than `-which(names(iris)=="Petal.Length")', to drop a variable using a string? Thank you Liviu -- Do you know how to read? http://www.alienetworks.com/srtest.cfm Do you know how to write? http://garbl.home.comcast.net/~garbl/stylemanual/e.htm#e-mail ______________________________________________ R-help@r-project.org mailing list https://stat.ethz.ch/mailman/listinfo/r-help PLEASE do read the posting guide http://www.R-project.org/posting-guide.html and provide commented, minimal, self-contained, reproducible code.
