Data Science & Statistics: Indexing an element from a matrix

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Learn how to select and extract single and multiple values from a matrix in R. Extracting a value from a matrix happens with square brackets, and the values you want extracted in them. If you’re working with more-dimensional objects, think of R’s extraction schema as looking like this: [ , ].

If we want to extract a row from a matrix, we should type row number, COMMA, and use a blank space to indicate that you want every value on that row.

The exact same logic applies to extracting an entire column from a matrix, but this time, the comma precedes the column index.

Selecting multiple elements.

When talking about vector slicing we learned that we can just pass a vector in the square brackets that indexes the multiple elements we want to extract. The same rule applies to matrices. For example, to select the 1st, 3rd, and 7th rows, all we need to do is open square brackets, pass in a vector of indexes where the rows element is – close the parentheses – comma, and close the square brackets.

We can subset matrices using the column names, and row names, too.

To extract a named row from a matrix, pass in the name of the row, and leave the space for columns blank.

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