Using the C++ Math Library

Overview

Logical indexing is a special case of n-dimensional indexing. A logical index is a vector or a matrix that consists entirely of ones and zeros. Applying a logical subscript to a matrix selects the elements of the matrix that correspond to the nonzero elements in the subscript.

Logical indices are generated by the relational operators (<, >, <=, >=, ==, !=) and by the function logical(). Because the MATLAB C++ Math Library attaches a logical flag to a logical matrix, you cannot create a logical index simply by assigning ones and zeros to a vector or matrix.

You can form an n-dimensional logical subscript by combining a logical index with scalar, vector, matrix, or colon() indices.

Using Logical Subscripts

Using a Logical Matrix As a One-Dimensional Index