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 GNU Octave Manual Version 3 by John W. Eaton, David Bateman, Søren HaubergPaperback (6"x9"), 568 pagesISBN 095461206XRRP £24.95 (\$39.95)

## 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 element-by-element 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 5 Strings.

Function File: isequal (x1, x2, ...)
Return true if all of x1, x2, ... are equal.