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2.1 Invoking Octave from the Command Line ¶ Normally, Octave is used interactively by running the program ‘octave’ without any arguments. Once started, Octave reads commands from the terminal until you tell it to exit.
- Getting Started (GNU Octave (version 9.2.0))
This chapter explains some of Octave’s basic features,...
- Using Octave - Octave
Then, start the GNU Octave by clicking the icon in the...
- Getting Started (GNU Octave (version 9.2.0))
I recently installed GNU Octave on my Mac using Homebrew and as soon as I typed octave into bash, it opened up the octave-gui window. The Octave GUI looks quite unappealing (on a mac, at least) so I wanted to use the command line interface. My fix was to create a permanent alias in ~/.bash_profile which was alias octave='octave --no-gui'.
This chapter explains some of Octave’s basic features, including how to start an Octave session, get help at the command prompt, edit the command line, and write Octave programs that can be executed as commands from your shell.
- Command Evaluation
- Elementary Math
- Matrices
- Linear Algebra
- Accessing Elements
- Control Flow with Loops
- Vectorization
- Plotting
- Strings
- Getting Help
The output of every command is printed to the console unless terminated witha semicolon ;. The disp command can be used to print outputanywhere. Use exit or quit to quit the console.Read more about command evaluation.
Many mathematical operators are available in addition to the standardarithmetic. Operations are floating-point. Read moreabout elementary math.
Arrays in Octave are called matrices. One-dimensional matrices are referredto as vectors. Use a space or a comma , to separate elements in a row andsemicolon ; to start a new row. Read moreabout matrices.
Many common linear algebra operations are simple to program using Octave’smatrix syntax. Read moreabout linear algebra.
Octave is 1-indexed. Matrix elements are accessed asmatrix(rowNum, columnNum). Read moreabout accessing elements.
Octave supports for and while loops, as well as other control flowstructures. Read moreabout control flow.
For-loops can often be replaced or simplified using vector syntax. Theoperators *, /, and ^ all support element-wise operations writinga dot . before the operators. Many other functions operate element-wiseby default (sin, +, -, etc.). Read moreabout vectorization.
The function plot can be called with vector arguments tocreate 2D line and scatter plots. Read moreabout plotting.
Strings are simply arrays of characters. Strings can be composed usingC-style formatting with sprintf orfprintf. Read moreabout strings.
The help and doccommands can be invoked at theOctave prompt to print documentation for any function.
Once started, Octave reads commands from the terminal until you tell it to exit. You can also specify the name of a file on the command line, and Octave will read and execute the commands from the named file and then exit when it is finished.
Once started, Octave reads commands from the terminal until you tell it to exit. You can also specify the name of a file on the command line, and Octave will read and execute the commands from the named file and then exit when it is finished.
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On most systems, the way to invoke Octave is with the shell command `octave'. Octave displays an initial message and then a prompt indicating it is ready to accept input. You can begin typing Octave commands immediately afterward.
