Question

What is the function to set column names for a matrix? (a) names() (b) colnames() (c) col.names() (d) column name cannot be set for a matrix This question was posed to me in a national level competition. This intriguing question originated from Overview of R in division History, Overview and Getting Started of R Programming Select the correct answer from above options

Answer 1

The correct option is (b) colnames() The explanation: colnames() is the function to set column names for a matrix. rownames() is the function to set row names for a matrix. But we can’t use both at a time. Column names and row names can be set separately using the colnames() and rownames() functions.