Delete a List Component in R

June 24, 2009

(This article was first published on Yu-Sung Su's Blog, and kindly contributed to R-bloggers)

In R, the way to delete a component in a list object is different from matrix and vector objects. For a vector, to delete an element:vec <- c(1, 2, 3)vec <- vec[-3]For a matrix, to delete a row or a column:mat <- matrix(c(1,2,3,4), 2, 2)mat2 <- mat[-1,] # delete a rowmat3 <- mat[,-1] # delete a columnFor a list, to delete a component:lis <- vector(“list”, 3)lis[[3]] <- NULLJust assign a NULL

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