Programming

Matrix Indexing

This section explains how to use subscripting and indexing to access and assign values to the elements of a MATLAB matrix. It covers the following:

• Accessing Single Elements
• Linear Indexing
• Functions That Control Indexing Style
• Accessing Multiple Elements
• Logical Indexing
• Indexing on Assignment

Accessing Single Elements

To reference a particular element in a matrix, specify its row and column number using the following syntax, where A is the matrix variable. Always specify the row first and column second:

• A(row, column)
  

For example, for a 4-by-4 magic square A,

• A = magic(4)
  A =
      16     2     3    13
       5    11    10     8
       9     7     6    12
       4    14    15     1
  

you would access the element at row 4, column 2 with

• A(4, 2)
  ans =
      14
  

For arrays with more than two dimensions, specify additional indices following the row and column indices. See the section on Multidimensional Arrays.

Combining Unlike Data Types

Linear Indexing

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