User:Σ/Testing facility/Sgn/doc

This template evaluates its numeric parameter and returns its mathematical sign. If the parameter is empty or missing, it returns an empty string. Otherwise, the return value is 1 if the parameter is positive, 0 if it is null, -1 if negative.

Syntax:

{{Σ/Testing facility/Sgn|value}}

Examples:

• "{{Σ/Testing facility/Sgn|100}}" = "1".
• "{{Σ/Testing facility/Sgn|0.1}}" = "1".
• "{{Σ/Testing facility/Sgn|1-1}}" = "0".
• "{{Σ/Testing facility/Sgn|-0.1}}" = "-1".
• "{{Σ/Testing facility/Sgn|-100}}" = "-1".
• "{{Σ/Testing facility/Sgn|}}" = "".