erf() — PostgreSQL mathematical function

erf(): error function. PostgreSQL mathematical functions — signature, volatility, version applicability and an illustrative example.

The Sev-1 Admin
The Sev-1 Admin  ·  1 min read

Summary

erf is a PostgreSQL built-in function in the Mathematical Functions group. PostgreSQL’s system catalog (pg_proc) describes it as: “error function”.

Signature

erf(double precision) → double precision

Argument and return types are taken from the pg_proc catalog; internal type names are shown using their readable SQL spellings (for example int4 is shown as integer). (Derived from the catalog — see the linked reference for the canonical documentation.)

Classification

  • Category: Mathematical Functions
  • Kind: Function
  • Volatility: IMMUTABLE — Marked IMMUTABLE — it always returns the same result for the same arguments and can be used in indexes and other contexts that require immutability.
  • Returns: double precision

Example

Illustrative form (replace placeholder values with your own data):

SELECT erf(3.14);

The example above is illustrative and is meant to show calling syntax only; consult the linked PostgreSQL documentation for exact semantics, edge cases and accepted argument combinations.

Version applicability

Based on the catalog across releases, erf first appears in PostgreSQL 16. It is present in: 16, 17, 18, 19.

Related & references

Reference: PostgreSQL documentation — Mathematical Functions.