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8.4 Comparison Operators
Comparison operators compare numeric values for relationships such as equality. They are written using relational operators.
All of Octave's comparison operators return a value of 1 if the comparison is true, or 0 if it is false. For matrix values, they all work on an elementbyelement basis. For example,
[1, 2; 3, 4] == [1, 3; 2, 4] ⇒ 1 0 0 1 
If one operand is a scalar and the other is a matrix, the scalar is compared to each element of the matrix in turn, and the result is the same size as the matrix.

x < y

True if x is less than y.

x <= y

True if x is less than or equal to y.

x == y

True if x is equal to y.

x >= y

True if x is greater than or equal to y.

x > y

True if x is greater than y.

x != y

x ~= y

True if x is not equal to y.
String comparisons may also be performed with the strcmp
function, not with the comparison operators listed above.
See section Strings.
 Function File: isequal (x1, x2, …)
Return true if all of x1, x2, … are equal.
See also: isequalwithequalnans.
 Function File: isequalwithequalnans (x1, x2, …)
Assuming NaN == NaN, return true if all of x1, x2, … are equal.
See also: isequal.