Scientific pitch notation creates a linear pitch space in which an octave spans 12 semitones, where each semitone is the distance between adjacent keys of the piano keyboard. Distance in this space corresponds to musical pitch distance in an equal-tempered scale; 2 semitones being a whole step, 1 semitone being a half step. An equal-tempered semitone can also be subdivided further into 100 cents. Each cent is semitone or octave. This measure of pitch allows the expression of "microtones" not found on standard piano keyboards. The notation is sometimes used in the context of meantone temperament, and does not always assume equal temperament
GNU Octave Octave, some of them are accessible through packages via Octave-forge, but not all MATLAB functions are available in GNU Octave. List of unavailable functions exists in Octave, and developers are seeking for help to implement them. Looking for function __unimplemented.m__, leads to the list of unimplemented functions. Unimplemented functions are also categorized in Image, Mapping, Optimization, Signal, and Statistics packages. When an unimplemented function is called the following error message is shown: Octave comes with an official graphical user interface (GUI) and a integrated development environment (IDE) based on Qt. It has been available since Octave 3.8, and has become