Octave species various available intervals could be combined in any order, even restricting species to just the diatonic genus would result in twelve ways of dividing the octave (and his 17th-century editor, Marcus Meibom, pointed out that the actual number is 21), but "only seven species or forms are melodic and symphonic" . Those octave species that cannot be mapped onto the system are therefore rejected . In chant theory beginning in the 9th century, the "New Exposition" of the composite treatise called "Alia musica" developed an eightfold modal system from the seven diatonic octave species of ancient Greek theory, transmitted to
GNU Octave the default interface (over the command line interface) with the release of Octave 4.0. It was well-received by EDN contributor, who said "[Octave] now has a very workable GUI." Several 3rd-party graphical front-ends have also been developed, like ToolboX for coding education. With Octave code, the user can create GUI applications . Here are some examples. Button, edit control, checkboxTextboxListbox with message boxes.Radiobuttons An advanced example of Octave GUI application composition can be seen in the FEATool Multiphysics FEM simulation toolbox. Octave also has packages available for free. Those packages are located at Octave-Forge . Available packages are: GNU Octave