complex

This Release
complex 0.5.0
Date
Status
Stable
Latest Testing
complex 0.4.0 —
Other Releases
Abstract
Complex number UDT
Description
C-language extension that provides a UDT for complex numbers. It is intended for educational purposes, not production use.
Released By
thebearinboulder
License
The PostgreSQL License
Resources
Special Files
Tags

Extensions

complex 0.5.0
Complex number UDT

README

pg_complex

PG_complex is a PostgreSQL C-language extension that implements a user-defined type (UDT) for complex numbers. It is intended for educational purposes, not production use.

(Seriously, why would anyone store complex numbers in a relational database?)

The UDT demonstrates the use of composite types.

A discussion of the creation and use of this extension can be found at http://invariantproperties.com/2015/07/17/extending-postgresql-complex-number-data-type/.

Installation

To build it, just do this:

make
make installcheck
make install

If you encounter an error such as:

"Makefile", line 8: Need an operator

You need to use GNU make, which may well be installed on your system as gmake:

gmake
gmake install
gmake installcheck

If you encounter an error such as:

make: pg_config: Command not found

Be sure that you have pg_config installed and in your path. If you used a package management system such as RPM to install PostgreSQL, be sure that the -devel package is also installed. If necessary tell the build process where to find it:

env PG_CONFIG=/path/to/pg_config make && make installcheck && make install

And finally, if all that fails (and if you're on PostgreSQL 8.1 or lower, it likely will), copy the entire distribution directory to the contrib/ subdirectory of the PostgreSQL source tree and try it there without pg_config:

env NO_PGXS=1 make && make installcheck && make install

If you encounter an error such as:

ERROR:  must be owner of database regression

You need to run the test suite using a super user, such as the default "postgres" super user:

make installcheck PGUSER=postgres

Once pg_complex is installed, you can add it to a database. If you're running PostgreSQL 9.1.0 or greater, it's a simple as connecting to a database as a super user and running:

CREATE EXTENSION pg_complex;

If you've upgraded your cluster to PostgreSQL 9.1 and already had pg_complex installed, you can upgrade it to a properly packaged extension with:

CREATE EXTENSION pg_complex FROM unpackaged;

For versions of PostgreSQL less than 9.1.0, you'll need to run the installation script:

psql -d mydb -f /path/to/pgsql/share/contrib/pg_complex.sql

If you want to install pg_complex and all of its supporting objects into a specific schema, use the PGOPTIONS environment variable to specify the schema, like so:

PGOPTIONS=--search_path=extensions psql -d mydb -f pg_complex.sql

Dependencies

The pg_complex data type has no dependencies other than PostgreSQL.

Copyright and License

Copyright (c) 2015 Bear Giles bgiles@coyotesong.com.