Using the C++ Math Library

Relational Operators

The relational operators compare two arrays and return an identically sized array of 1's and 0's with the logical flag set. They perform an element-wise comparison of their inputs. The operators work as follows: given an expression C = (A op B), where op is one of the operators below, then C[i] == 1 if
(A[i] op B[i]) is true and C[i] == 0 otherwise.

For example, if A is the matrix [ 1 2 ; 3 4 ] and B is the matrix
[ 0 2 ; 1 6 ], then A > B is [ 1 0 ; 1 0 ]. The result contains 1's where the greater-than relationship between the corresponding elements of A and B is true, and the result contains 0's where it is false. The result of a relational operation is a logical array.

Using Logical Subscripts in Chapter 4 provides information on logical indexing.

Table 11-3: C++ Relational Operators 

C++ Operator	Definition	Equivalent C++ Function
>	Greater than	gt()
<	Less than	lt()
>=	Greater than or equal	ge()
<=	Less than or equal	le()
==	Strictly equal	eq()
!=	Not equal	neq(), ne()

Arithmetic Operators

Miscellaneous Operators