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This is a list of frequently asked questions (FAQ) for GNU Octave users. | This is a list of frequently asked questions (FAQ) for GNU Octave users. | ||
We are always looking for new questions (with answers), better answers, or both. Feel free to edit this page with your changes. If you have general questions about GNU Octave, or need help for something that is not covered by the Octave manual or the FAQ, please use the [https:// | We are always looking for new questions (with answers), better answers, or both. Feel free to edit this page with your changes. If you have general questions about GNU Octave, or need help for something that is not covered by the Octave manual or the FAQ, please use the [https://lists.gnu.org/mailman/listinfo/help-octave help@octave.org mailing list]. | ||
This FAQ is intended to supplement, not replace, [https://www.gnu.org/software/octave/octave.pdf | This FAQ is intended to supplement, not replace, the GNU Octave manual ([https://www.gnu.org/software/octave/doc/interpreter/ HTML], [https://www.gnu.org/software/octave/octave.pdf PDF]). Before posting a question to the [https://lists.gnu.org/mailman/listinfo/help-octave help@octave.org mailing list], you should first check to see if the topic is covered in the manual. | ||
<div class="tocinline">__TOC__</div> | <div class="tocinline">__TOC__</div> | ||
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==What is Octave-Forge?== | ==What is Octave-Forge?== | ||
[ | |||
[https://octave.sourceforge.io/ Octave-Forge] is a collection of packages for GNU Octave, something similar to the Matlab toolboxes. When talking about the two projects at the same time, GNU Octave is usually referred to as Octave core (or just ''core''). [https://octave.sourceforge.io/ Octave-Forge] also serves as a test bed for code that may eventually end up in the core, and distributes binaries for systems with a lack of developers tools (mainly Windows). | |||
==Who uses Octave?== | ==Who uses Octave?== | ||
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* http://www.octave.org/download.html | * http://www.octave.org/download.html | ||
* | * https://ftp.gnu.org/gnu/octave/ | ||
Since Octave is distributed under the terms of the GPL, you can get Octave from a friend who has a copy, or from the Octave website. | Since Octave is distributed under the terms of the GPL, you can get Octave from a friend who has a copy, or from the Octave website. | ||
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As a natural extension of this, functions can also be defined in script files (m-files whose first non-comment line isn't {{Codeline|function out = foo (...)}}) | As a natural extension of this, functions can also be defined in script files (m-files whose first non-comment line isn't {{Codeline|function out = foo (...)}}) | ||
Note: MATLAB R2016b added the ability to [http://www.mathworks.com/help/matlab/matlab_prog/local-functions-in-scripts.html define functions in script files]. | |||
===Comments with #=== | ===Comments with #=== | ||
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===Broadcasting=== | ===Broadcasting=== | ||
Borrowed from [http://stackoverflow.com/q/26948776/3565696 other languages], [http://www.gnu.org/software/octave/doc/v4.0.1/Broadcasting.html octave broadcasting] allows easy and readable | Borrowed from [http://stackoverflow.com/q/26948776/3565696 other languages], [http://www.gnu.org/software/octave/doc/v4.0.1/Broadcasting.html octave broadcasting] allows easy and readable vectorization. | ||
f = (1:0.1:2); | f = (1:0.1:2); | ||
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xlabel("t (s)") | xlabel("t (s)") | ||
ylabel("f (Hz)") | ylabel("f (Hz)") | ||
Note: [https://www.mathworks.com/help/matlab/matlab_prog/compatible-array-sizes-for-basic-operations.html Automatic expansion of dimensions] was added to MATLAB R2016b. | |||
==How does Octave solve linear systems?== | ==How does Octave solve linear systems?== | ||
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See also https://www.opengl.org/wiki/FAQ#Why_is_my_GL_version_only_1.4_or_lower.3F | See also https://www.opengl.org/wiki/FAQ#Why_is_my_GL_version_only_1.4_or_lower.3F | ||
== Plot hangs and makes the GUI unresponsive == | |||
If the Qt graphics toolkit is used and "plot" is used for the first time, the fontconfig scanner searches the font directory to build a font cache. This can take up to 3min on slow CPUs. See {{bug|45458}} | |||
= Differences between Octave and Matlab = | = Differences between Octave and Matlab = | ||