Summary:
Square root.

Syntax:
sqrt( expr)

Description:
If expr evaluates to a non-negative number, returns the float value , otherwise returns an error.

Example:

variable:
  type: float
statut ENDOGENE
definition: 
  distance = sqrt((city1.x - city2.x) ^ 2 + (city1.y - city2.y) ^ 2)

^