Users' questions

What is a row name?

What is a row name?

All data frames have a row names attribute, a character vector of length the number of rows with no duplicates nor missing values. For convenience, these are generic functions for which users can write other methods, and there are default methods for arrays.

What is the row of a matrix?

The numbers, symbols, or expressions in the matrix are called its entries or its elements. The horizontal and vertical lines of entries in a matrix are called rows and columns, respectively.

How do you name a matrix row and column?

The rbind() function in R conveniently adds the names of the vectors to the rows of the matrix. You name the values in a vector, and you can do something very similar with rows and columns in a matrix. For that, you have the functions rownames() and colnames().

How do I change row names in R?

Method 1 : using rownames() A data frame’s rows can be accessed using rownames() method in the R programming language. We can specify the new row names using a vector of numerical or strings and assign it back to the rownames() method. The data frame is then modified reflecting the new row names.

What are the names of the matrix baskets?

The matrix already has some row names. It would be better if the names of the rows would just read “Granny” and “Geraldine”. You can easily change these row names like this: You can look at the matrix to check if this did what it’s supposed to do, or you can take a look at the row names itself like this:

When to use row and column names in matrix?

These row and column names can be used just like you use names for values in a vector. You can use these names instead of the index number to select values from a vector. This works for matrices as well, using the row and column names. Exactly as before, you get all rows if you don’t specify which ones you want.

What are the entries and columns of a matrix?

Each item in a matrix is called an entry. The matrix pictured below has two rows and three columns. The entries of the matrix below are 2, -5, 10, -4, 19, 4. The dimensions of a matrix refer to the number of rows and columns of a given matrix. By convention the dimension of a a matrix are given by number of rows • number of columns

Who are the real people in the matrix?

Case in point, Ma Xiangang, a Chinese man who is not only seemingly immune to large amounts of electricity but energized (no pun) by it. In a real-life Matrix scenario, millions of pods full of humans with The Electric Man’s special powers might make sense when it comes to powering more than a cheap toaster.