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19-424: The project was conceived around 1988. At first it was intended to be a companion to a chemical reactor design course. Full development was started by John W. Eaton in 1992. The first alpha release dates back to 4 January 1993 and on 17 February 1994 version 1.0 was released. Version 9.2.0 was released on 7 June 2024. The program is named after Octave Levenspiel , a former professor of the principal author. Levenspiel

38-640: A script . The syntax is matrix -based and provides various functions for matrix operations. It supports various data structures and allows object-oriented programming . Its syntax is very similar to MATLAB, and careful programming of a script will allow it to run on both Octave and MATLAB. Because Octave is made available under the GNU General Public License , it may be freely changed, copied and used. The program runs on Microsoft Windows and most Unix and Unix-like operating systems , including Linux , Android , and macOS . Typing

57-464: A TAB character on the command line causes Octave to attempt to complete variable, function, and file names (similar to Bash 's tab completion ). Octave uses the text before the cursor as the initial portion of the name to complete. When running interactively, Octave saves the commands typed in an internal buffer so that they can be recalled and edited. Octave includes a limited amount of support for organizing data in structures. In this example, we see

76-512: A limited form of exception handling modelled after the unwind_protect of Lisp . The general form of an unwind_protect block looks like this: As a general rule, GNU Octave recognizes as termination of a given block either the keyword end (which is compatible with the MATLAB language) or a more specific keyword end block or, in some cases, end_ block . As a consequence, an unwind_protect block can be terminated either with

95-586: A structure x with elements a , b , and c , (an integer, an array, and a string, respectively): Octave's && and || logical operators are evaluated in a short-circuit fashion (like the corresponding operators in the C language), in contrast to the element-by-element operators & and | . Octave includes the C-like increment and decrement operators ++ and -- in both their prefix and postfix forms. Octave also does augmented assignment , e.g. x += 5 . Octave supports

114-444: Is a type of computer file that provides an interface between MATLAB or Octave and functions written in C , C++ or Fortran . It stands for "MATLAB executable". When compiled, MEX files are dynamically loaded and allow external functions to be invoked from within MATLAB or Octave as if they were built-in functions. To support the development of MEX files, both MATLAB and Octave offer external interface functions that facilitate

133-534: Is also possible for anyone to create and maintain packages. Alternatives to GNU Octave under an open source license, other than the aforementioned MATLAB, include Scilab and FreeMat . Octave is more compatible with MATLAB than Scilab is, and FreeMat has not been updated since June 2013. Also the Julia programming language and its plotting capabilities has similarities with GNU Octave. Octave Levenspiel Octave Levenspiel (January 1, 1926 – March 5, 2017)

152-456: Is an interpreted programming language. It is a structured programming language (similar to C ) and supports many common C standard library functions, and also certain UNIX system calls and functions. However, it does not support passing arguments by reference although function arguments are copy-on-write to avoid unnecessary duplication. Octave programs consist of a list of function calls or

171-426: Is named after him. Levenspiel was well known among his students for his ability to do quick back-of-the-envelope calculations . GNU Octave , a high-level language primarily intended for numerical computations and developed by John W. Eaton, a former student of Octave Levenspiel, is named after him. All of Levenspiel's books listed below have been translated to several other languages. MEX file A MEX file

190-436: Is only executed when an exception is raised by body . Second, after the execution of exception_handling the exception is not propagated outside the block (unless a rethrow( lasterror ) statement is explicitly inserted within the exception_handling code). Octave has a mechanism for handling functions that take an unspecified number of arguments without explicit upper limit. To specify a list of zero or more arguments, use

209-656: The Wayback Machine . A list of unavailable functions is included in the Octave function __unimplemented.m__ . Unimplemented functions are also listed under many Octave Forge packages in the Octave Wiki . When an unimplemented function is called the following error message is shown: Octave comes with an official graphical user interface (GUI) and an integrated development environment (IDE) based on Qt . It has been available since Octave 3.8, and has become

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228-649: The FileExchange Terms of use prohibit any usage beside MathWorks' proprietary MATLAB. There are a few purposeful, albeit minor, syntax additions Archived 2012-04-26 at the Wayback Machine : Many, but not all, of the numerous MATLAB functions are available in GNU Octave, some of them accessible through packages in Octave Forge . The functions available as part of either core Octave or Forge packages are listed online Archived 2024-03-14 at

247-616: The MATLAB compatible MEX files . Octave has been built with MATLAB compatibility in mind, and shares many features with MATLAB: Octave treats incompatibility with MATLAB as a bug ; therefore, it could be considered a software clone , which does not infringe software copyright as per Lotus v. Borland court case. MATLAB scripts from the MathWorks ' FileExchange repository in principle are compatible with Octave. However, while they are often provided and uploaded by users under an Octave compatible and proper open source BSD license ,

266-688: The age of 15, he was on a ship to the US when the Attack on Pearl Harbor occurred, so he was interned in Manila until the end of the war . In the US, he graduated with a bachelor's degree from Berkeley in 1947. He obtained his PhD from OSU in 1952, and after a period teaching at other schools returned to OSU where he spent the remainder of his career, retiring in 1991 but continuing as emeritus professor. In 1952 he married Mary Jo Smiley and they had three children. He died on March 5, 2017. The Levenspiel plot

285-693: The default interface (over the command-line interface ) with the release of Octave 4.0. It was well-received by an EDN contributor, who wrote "[Octave] now has a very workable GUI" in reviewing the then-new GUI in 2014. Several 3rd-party graphical front-ends have also been developed, like ToolboX for coding education. With Octave code, the user can create GUI applications. See GUI Development (GNU Octave (version 7.1.0)) . Below are some examples: Button, edit control, checkbox Textbox Listbox with message boxes. Radiobuttons Octave also has many packages available. Those packages are located at Octave-Forge Octave Forge - Packages , or Github Octave Packages . It

304-507: The keyword end_unwind_protect as in the example, or with the more portable keyword end . The cleanup part of the block is always executed. In case an exception is raised by the body part, cleanup is executed immediately before propagating the exception outside the block unwind_protect . GNU Octave also supports another form of exception handling (compatible with the MATLAB language): This latter form differs from an unwind_protect block in two ways. First, exception_handling

323-483: The special argument varargin as the last (or only) argument in the list. varargin is a cell array containing all the input arguments. A function can be set up to return any number of values by using the special return value varargout . For example: It is also possible to execute Octave code directly in a C++ program. For example, here is a code snippet for calling rand([10,1]) : C and C++ code can be integrated into GNU Octave by creating oct files, or using

342-549: Was a professor of chemical engineering at Oregon State University (OSU). His principal interest was chemical reaction engineering , and he was the author of a major textbook Chemical Reaction Engineering as well as numerous research publications. Levenspiel was born in Shanghai , Republic of China , in 1926, the son of Abe and Lily Levenspiel, who were Polish Jews who had gone to China to escape oppression in Europe. At

361-453: Was known for his ability to perform quick back-of-the-envelope calculations . In addition to use on desktops for personal scientific computing, Octave is used in academia and industry. For example, Octave was used on a massive parallel computer at Pittsburgh Supercomputing Center to find vulnerabilities related to guessing social security numbers. Acceleration with OpenCL or CUDA is also possible with use of GPUs. The Octave language

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