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The Julia Language: a fresh approach to technical computing.
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Julia is a high-level, high-performance dynamic language for numerical and scientific computing. It provides a sophisticated compiler, parallel execution, and numerical accuracy. Key features include multiple dispatch, optional typing, and excellent performance through type inference and just-in-time (JIT) compilation. The language is multi-paradigm, combining features of functional, object-oriented, and imperative styles. For a more in-depth discussion of the rationale and advantages of Julia over other systems, see the Introduction in the wiki, or browse all of the wiki documentation.


Required Build Tools & External Libraries

  • GNU make — building dependencies.
  • gcc, g++, gfortran — compiling and linking C, C++ and Fortran code.
  • curl — to automatically download external libraries:
    • LLVM — compiler infrastructure
    • fdlibm — a portable implementation of much of the system-dependent libm math library's functionality.
    • MT — a fast Mersenne Twister pseudorandom number generator library.
    • OpenBLAS — a fast, open, and maintained basic linear algebra subprograms (BLAS) library, based on Kazushige Goto's famous GotoBLAS.
    • LAPACK — library of linear algebra routines for solving systems of simultaneous linear equations, least-squares solutions of linear systems of equations, eigenvalue problems, and singular value problems.
    • ARPACK — a collection of subroutines designed to solve large, sparse eigenvalue problems.
    • FFTW — library for computing fast Fourier transforms very quickly and efficiently.
    • PCRE — Perl-compatible regular expressions library.
    • GNU readline — library allowing shell-like line editing in the terminal, with history and familiar key bindings.

Supported Platforms

  • GNU/Linux: x86/64 (64-bit); x86 (32-bit).
  • Darwin/OS X: x86/64 (64-bit); x86 (32-bit) is untested but should work.

Download & Compilation

First, acquire the source code either by cloning the git repository (requires git to be installed):

git clone git://

or, if you don't have git installed, by using curl and tar to fetch and unpack the source:

mkdir julia && curl -Lk | tar -zxf- -C julia --strip-components 1

TODO: check that this actually works once the repository is public.

Next, enter the julia/ directory and run make to build the julia executable. When compiled the first time, it will automatically download and build its external dependencies. This takes a while, but only has to be done once.

No installation is required; julia is currently run from the directory where it was built. You might, however, want to make a symbolic link for the executable, for example ln -s JULIA_PATH/julia ~/bin/julia. Please note that the build process will not work if any of the build directory's parent directories have spaces in their names (this is due to a limitation in GNU make).

Congratulations, if you've gotten this far, you are ready to try out Julia. You can read about getting started in the manual.


attic/         old, now-unused code
contrib/       emacs and textmate support for julia
doc/           miscellaneous documentation and notes
external/      external dependencies
j/             source code for julia's standard library
lib/           shared libraries loaded by julia's standard libraries
src/           source for julia language core
test/          unit and function tests for julia itself
ui/            source for various front ends

Emacs Setup

Add the following line to ~/.emacs

(require 'julia-mode "JULIA_PATH/contrib/julia-mode.el")

where JULIA_PATH is the location of the top-level julia directory.

TextMate Setup

Copy (or symlink) the TextMate Julia bundle into the TextMate application support directory:

cp -r JULIA_PATH/contrib/Julia.tmbundle ~/Library/Application\ Support/TextMate/Bundles/

where JULIA_PATH is the location of the top-level julia directory. Now select from the menu in TextMate Bundles > Bundle Editor > Reload Bundles. Julia should appear as a file type and be automatically detected for files with the .j extension.


Julia is licensed under the three clause "Modified BSD License", with the exception of certain components that link against GPL-licensed libraries (e.g. GNU readline). See LICENSE for the full terms of the license.

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