Rows, Columns and the Main Diagonal of a Matrix
The matrix shown has entries , where and .[more]
For example, the entry in the top-left corner is , where row 1 and column 1 intersect.
The entry is where row 3 and column 7 intersect.
The first row is the vector , where the first index is 1, the row number.
The second column is the vector , where the second index is 2, the column number.
The main diagonal consists of the entries for which .[less]