# sqrt

The`sqrt`

filter is a numeric filter whose value is the integer square root of its argument:
sqrt 4 ≡ 2 sqrt 26 ≡ 5If the argument to the

`sqrt`

filter does not match the currentposition, neither does the `sqrt`

filter. If the argument to `sqrt`

is negative, the `sqrt`

filter does not match the position.
The `sqrt`

filter is mainly used in computing the Euclidean distance between two squares *s* and *t*, but the distance
has to be scaled because CQL only has integers. See the cql file averagedistance.cql for an example of this usage.