We are numerical.recipes, Numerical Recipes Software. We are one of the oldest continuously operating sites on the Web, with the historic former domain nr.com dating back to 1993, one of the first 25,000 domains in the Internet. (Today, that number is about 200,000,000.) In partnership with Cambridge University Press, we develop the Numerical Recipes series of books on scientific computing and related software products.

On 12/31/2020, Adobe Inc. inactivated Adobe Flash in all browsers, including on users' own computers. Wow, what a mess! Our Empanel and Rollover bookreader software depended on Flash and are gone. But we have new bookreader, custom written in pure Javascript so that it will work for a long time. Subscribers and guests can find the book here!

You can call Numerical Recipes routines (along with any other C++ code) from Python. A tutorial with examples is here. A free interface file is here.

You can use Numerical Recipes to extend MATLAB^®, sometimes giving huge speed increases. A tutorial with examples is here. A free interface file is here.

Numerical Recipes in Java™! High-quality translations of our version 3.04 C++ code have been contributed by a Numerical Recipes user. They are available to all other licensed Numerical Recipes users. More information...

Our biggest downloadable code product is for users, scholars, or just fans, of legacy computer languages. The NR all-languages download includes the latest C++ version; 2nd edition versions in C, Fortran 77 and 90; 1st edition versions in Pascal, Basic, Modula 2, and Lisp; plus bonus historical Numal code in Algol 60.

Our older editions in C (1992) and Fortran (1992, 1996), long out of print, are also now available, free, in our bookreader format. We also host some old classics, including Abramowitz and Stegun, and the Encyclopedia Britannica Eleventh Edition (1911).

In cooperation with ICTP, a UNESCO and IAEA organization, Numerical Recipes Third Edition (on-line book and code) is available by open access to users in developing countries (list). The electronic book can be accessed here, and machine-readable code can be downloaded here.

Individual subscribers to Numerical Recipes Electronic who also own the book, can convert their subscriptions to "lifetime" subscriptions. (More info here, or go here to subscribe right now.)

Third Edition (2007), 1256 pp.
Cambridge University Press
ISBN-10: 0521880688

• Learn more about the book.
• Buy the book now from Amazon.com.
• Or, buy the book and code CDROM bundle.
• Or, find the book in stock at most college and technical bookstores, as well as larger general bookstores.

Numerical Recipes Electronic puts the full content of the Numerical Recipes book onto your computer screen, along with with many extras.

Frequently updated, Numerical Recipes Electronic is available by subscription (3 year term, convertible to "lifetime").

• Go to Numerical Recipes Electronic now. (Guests will experience nags; subscribers have faster, full access with no nags.)
• Purchase an immediate subscription at the Numerical Recipes On-Line Store.
• Go to all of our ebooks. Free on-line versions of our older editions, plus Abramowitz and Stegun, EB Eleventh Edition, and more.
• Learn more about Numerical Recipes Electronic.
• Learn about institutional subscriptions, which include both Numerical Recipes Electronic and Numerical Recipes Code
• Use coupon in the book to convert an electronic subscription to "lifetime".

Numerical Recipes Code is the C++ computer code from the Numerical Recipes book in machine readable form (or legacy code in other computer languages from earlier editions). It is ready to be included in a user's own programs. The code, including a license for such use, is sold separately from Numerical Recipes (the book) or Numerical Recipes Electronic (the book on-line).

• Buy the code as an immediate electronic download (3rd ed. C++, legacy 2nd ed. C or Fortran, or other languages from earlier editions).
• Learn more about Numerical Recipes Code.
• See complete license terms.
• Buy the code on CDROM from Amazon.com. The CDROM includes 3rd edition C++ and all legacy 1st and 2nd edition code in C++, C, Fortran 77, Fortran 90, Pascal, BASIC, Modula 2, LISP, and more.
• Or, buy the book and code CDROM bundle.
• Learn about institutional subscriptions, which include both Numerical Recipes Electronic and Numerical Recipes Code
• See all code changes from version 3.00/3.01 to 3.02 or from 3.02 to 3.04 (current version).

The Numerical Recipes Forum is where readers can ask questions, or reply to postings submitted by other readers. This free resource is also where official bug reports are posted.

• Go to the forum.

Or, in case of a browser incompatibility or any other problem, you can

• Go to a static archive of the forum.

• How to contact us.
• General information about licenses.
• Single user and institutional subscriber license terms.
• Institutional subscriptions (site license) information.
• Open Access for users in developing countries.
• Converting electronic subscriptions to "lifetime".
• Obtaining permission for commercial use.
• Download nr3.h header file (necessary for using NR3 C++ code)
• Tutorial on extending MATLAB with Numerical Recipes
• Download nr3matlab.h header file (for interfacing to MATLAB)
• Older Books On-Line (NR and others we host)
• Other stuff.

There are many legacy applications that use obsolete Second Edition, or even First Edition, Numerical Recipes code. Also, computer languages such as C, Fortran, Pascal, Modula 2, BASIC, and Lisp were available only in previous editions. Though out of print, many of these products are still available for users with a special need for them.

• Learn more about previous versions.
• Free on-line versions in our bookreader interface:
  Numerical Recipes in C (1992)
  Numerical Recipes in Fortran 77 and Fortran 90 (1992, 1996)
• Other on-line books we host
• Buy new or used copies from Amazon.com:
  Numerical Recipes in C (1992)
  Numerical Recipes in Fortran 77 (1992)
  Numerical Recipes in Fortran 90 (1996)

All code from previous versions in all computer languages is included, along with the new 3rd edition C++ code, in the NR All-Languages Download, and on the Numerical Recipes Code CDROM:

• Buy the immediate download.
• Buy the code CDROM from Amazon.com.

Browse our personally recommended titles in the Numerical Recipes Bookstore, with fulfillment by Amazon.com. (We get a small incentive from them.)

The Numerical Recipes Bookstore

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