Section: User Commands (1)
Updated: 25 September 2013
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gp - The PARI calculator
[ file1 file2 ...]
Invokes the PARI-GP calculator
gp; gp is an advanced programmable calculator, specializing in number
theory, which computes symbolically as long as possible, numerically where
needed, and contains a wealth of arithmetic functions: factorizations,
elliptic curves, Galois theory, class field theory... Commands, written in
the GP scripting language, are input interactively or loaded from files.
If present at the end of the command line, files 'file1', 'file2', ...
are loaded on startup; they must be written in the GP language.
Command line options are available in both short form (-f) and POSIX-like
(--fast). Numeric arguments can be followed by a modifier
at the user's convenience; in that case the argument is multiplied by 10^3,
10^6, or 10^9 respectively.
- -f, --fast
Fast start (or factory settings). Do not read
(see below) upon startup.
- -p limit
Upon startup, gp computes a table of small primes used in
number-theoretic applications. If
is set, the table include primes up to that bound instead of the default
(= 500000). It is now mostly useless to change this value.
- -q, --quiet
Quiet mode. Do not print headers or history numbers and do not say goodbye.
- -D, --default key=val
on startup, overriding values from the
preferences file. 'val' must be a constant value and is not allowed to
involve any computation (e.g. 1+1 is forbidden). Any number of such
default-setting statements may appear on the command line.
- -s limit
Size of gp internal stack allocated on startup. When gp runs out of space, it
interrupts the current computation and raises a
exception. If this occurs frequently, start with a bigger stack. The stack
size can also be
increased from within gp, using
it may be convenient to set
Note that computations with a
stack may be more efficient due to better data locality. Most computations
should need less than 20MB.
gp can be run in an
shell (see GP User's manual for details). This flag is then required for
smooth interaction with the
package (pari.el). It is set automatically by the pari.el package, and will
produce nice display oddities if you set it outside of an
print a summary of available command-line options.
run gp in test mode: suppress printing of history numbers and wrap long
output lines (to get readable diff output). For benches only.
gp can be run from a
frontend. This flag is set by TeXmacs, to enable special purpose
communication channels. Do not set it yourself.
output version info (banner) then exit.
output version number then exit.
to get online help.
to get extended online help (more precisely, to call the external help
(or \q), or
(Ctrl-D) to quit
The following works only when gp was linked with GNU
- arrow keys
for editing and viewing the input history.
for automatic completion
The following material is included in the standard distribution (originally
in TeX format):
- The User's Guide to PARI/GP
- The User's Guide to the PARI library
- The Developer's Guide to the PARI library
- PARI/GP, a tutorial
- PARI/GP reference card
(refcard.ps): 4 pages, based on an earlier version by Joseph H. Silverman.
(or $GPRC if set) user preference file, read at beginning of execution by
shell. A default gprc
is provided with the distribution. If this file cannot be found,
is checked instead.
default logfile (can be changed in the gprc file or interactively using
default psfile used for postscript output (as above)
default external help program (as above)
place to look for the user's preference file (gprc); if the file does not exist,
we then check in $HOME/.gprc, /etc/gprc, and finally for a file named 'gprc'
directory containing data installed by optional PARI packages.
For example, the Galois resolvents files in directory
needed by the
function, in degrees 8 to 11; or the modular polynomials in
used by the
function for large base fields. This environment variable
overrides PARI's 'datadir', defined at Configure time.
an application able to display PostScript files, used by the
graphic engine. This engine is a fallback used to output hi-res plots even
when no compatible graphical library was available on your platform at
Configure time. (Dumps the graph to a temporary file, then open the file.)
name of the external help program invoked by ?? and ??? shortcuts.
name of the directory where temporary files will be generated.
PARI's home page resides at
There are a number of mailing lists devoted to the PARI/GP package, and most
feedback should be directed to those. See
for details. The most important ones are:
(moderated): for us to announce major version changes.
for everything related to the development of PARI, including
suggestions, technical questions, bug reports or patch submissions.
for discuss about everything else, in particular ask for help.
To subscribe, send empty messages with a Subject: containing the word
"subscribe" respectively to
Bugs should be submitted online to our Bug Tracking System, available from
PARI's home page, or directly from the URL
Further instructions can be found on that page.
Despite the leading G, GP has nothing to do with GNU. The first version was
originally called GPC, for Great Programmable Calculator. For some reason,
the trailing C was eventually dropped.
PARI has nothing to do with the French capital. The name is a pun about the
project's early stages when the authors started to implement a library for
"Pascal ARIthmetic" in the PASCAL programming language. They quickly
switched to C.
For the benefit of non-native French speakers, here's a slightly expanded
(1623-1662) was a famous French mathematician and philosopher who was one
of the founders of probability and devised one of the first "arithmetic
machines". He once proposed the following "proof" of the existence of God
for the unbelievers: whether He exists or not I lose nothing by believing
in Him, whereas if He does and I misbehave... This is the so-called "pari
de Pascal" (Pascal's Wager).
Note that PARI also means "fairy" in Persian.
PARI was originally written by Christian Batut, Dominique Bernardi, Henri
Cohen, and Michel Olivier in Laboratoire A2X (Universite Bordeaux I, France),
and was maintained by Henri Cohen up to version 1.39.15 (1995), and by Karim
Belabas since then.
A great number of people have contributed to the successive improvements
which eventually resulted in the present version. See the AUTHORS file in
This program is free software; you can redistribute it and/or modify it under
the terms of the GNU General Public License as published by the Free Software
This program is distributed in the hope that it will be useful, but WITHOUT
ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS
FOR A PARTICULAR PURPOSE. See the GNU General Public License for more details.
You should have received a copy of the GNU General Public License along with
this program; if not, write to the Free Software Foundation, Inc., 675 Mass
Ave, Cambridge, MA 02139, USA.
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- SEE ALSO
This document was created by
using the manual pages.
Time: 10:50:46 GMT, June 29, 2016