~=

The ~= operator consumes three parameters from the top of the stack, two operands p1 and p2 and a tolerance factor lambda, and pushes onto the stack true if |p1-p2| < lambda, i.e. the difference between the two operands is lesser than lambda.

All parameters must be of numeric types.

The operator ~= is useful when making comparaisons between doubles, where floating point operations generate rounding errors.