Download the DMG. There is an experimental dmg for Octave 4.0.0. See the bottom of this mailing list discussion.Testers are very welcome. The latest MacOS X binary (DMG) available is for Octave-3.4. Someone, with a Mac OS10.4.xx, to tell me step by step, what i need to run Octave, where to get what i need, and precisely the installation method. I thought just following the directions on the Mac install page (getting Octave and gnuplot) would be enough, but it evidently is not.
Download and install Octave
There are a number of Open Source alternatives to the program MatLab, one of the most known alternatives is GNU Octave. When using Octave you use a command line to enter commands. Octave can be downloaded and installed from GNU Octave.
Install on Mac
If using Mac:
Install Homebrew.
Install XCode from App Store.
Open and run the XCode app to agree to the License Agreement.
Install XQuartz.
Import science packages, open the terminal and enter:
Install Octave (this takes time):
Update:
At the end of the process a summary is shown displaying the path to Octave. If following is shown:
then the path to Octave is
/usr/local/Cellar/octave/3.8.1/bin/Octave
Open AppleScript Editor and make a New Document. Write following:where
/path/to/octave
is the path. Save the script as Octave.app, select Application when saving.For more information see Octave for MacOS X.
As a calculator
The easiest way to get started, is to use Octave as a calculator.
The arithmetic operators are:
There are predefined constants in Octave, some of them are listed below:
constant | explanation |
---|---|
pi , e , i | Make a wild guess! |
Inf (infinity) | Operations yielding numbers larger than the maximum floating point will give this answer. |
NaN (not a number) | Operations that can not be defined in any reasonably way will give this answer |
There are also a number of predefined mathematical functions in Octave, some of them are listed below:
function | explanation |
---|---|
sin, cos, tan | Trigonometric functions using radians |
asin, acos, atan | Inverse trigonometric functions |
exp, log, log10 | Exponential function, natural logarithm, logarithm to the base 10 |
sqrt | Square root |
abs | Absolute value |
round, floor, ceil | Round to nearest integer, round down, round up |
rem | Remainder when doing integer division |
Showing more decimals
You can show more decimals by typing
format long
. Go back to showing few decimals by typing format short
.Exercise 1
Calculate following expressions
- (sqrt[5]{200})
- (dfrac{3cdot 10^{-3}}{0.001+sqrt{0.2}})
- (dfrac{2^{3+sin{0.3}}+5}{10})
You should get these answers
ans = 2.8854
ans = 0.0066932
ans = 1.4819
You can see old commands by using up/down arrow keys.
Exercise 2
Guess the output of following commands, then check the answers given by Octave
1/0 0/0 tan(pi/2)
inf+inf inf-inf inf/inf inf*inf
nan+2 nan+nan
Exit Octave
Exit Octave by writing
exit
or quit
.Numerical variables
When evaluating the value of an expression, the result is stored in a variable called
ans
(answer). You can also introduce variables of your own.By writing
who
you can see all variables. If you write a semi colon at the end of the line, the output is not shown.Naming variables
Various programs have different rules for naming entities. Although some modern programs allow for all kind of characters in names, you may run into trouble if you use characters like '-' or blank. If you want to stay on the safe side, never having to bother about naming-rules for specific programs, follow these old-school rules:
- The first character must be an english letter :
a
-z
,A
-Z
Some programs can handle letters like å, Æ, Ç, ü; others cannot. Use english names when programming! - The name can include numbers :
0
-9
- The name can include underscore :
_
Octave For Macos Download
These rules apply to Octave and a number of other programs.
Assignments
When writing
a=5
at the command prompt, the equal-sign should not be thought of as a logical equality; a
is not equal to 5, it is assigned the value 5. Having that in mind, one can write assignments like thisThe statement above would be false if it was a logical statement, it is however not a logical statement but an assignment. The right-hand-side of the statement is calculated first, the result is then assigned to the variable on the left-hand-side.
Hiding the output and repeating previous commands
You can write several commands on one line by using comma, or semi colon. By using up-arrow, you can repeat the previous command, and alter it.
You can calculate a geometric series by using up-arrow several times.
Exercise 3
Calculate the series:
[sum_{i=1}^{20} left(frac{1}{i} right)^2 ] (The answer is 1.5962)
Exercises on Sequences
A sequence is a function with the domain being the natural numbers. A sequence can be written like this (a_0,a_1,a_2,..) or like this
[left( a_n right)_{n=0}^{infty} ] Recurrence equations
A geometric progression can be defined in different ways. Consider the infinite geometric progression (3, 3cdot 2, 3cdot 2^2,..).
You can describe the geometric progression in two ways.
A recurrence equation:
[ left{ begin{align} a_0 &=3 a_{n+1} &=2cdot a_n, ngeq0 end{align} right. ] An explicit formula:
Octave For Mac Os High Sierra
[a_n=3cdot 2^n, nin mathbb{n}]Exercise 4
Use Octave to find the limit as (nrightarrowinfty) of following sequences. Type
format long
to show more decimals. Try different initial values (c), do you get different limits?- [ left{ begin{align} a_0 &=c a_{n+1} &=1+frac{1}{a_n}, ngeq0 end{align} right. ]
- [ left{ begin{align} a_0 &=c a_{n+1} &=sqrt{1+a_n}, ngeq0 end{align} right. ]
Try to explain your answers. If you fail, do the exercises on Calculus - Fixpoints.
Posted on July 11, 2019 by Paul
In this article, I will show you how to install and get started with GNU Octave on macOS. In order to test the installation and to exemplify the usage, I will show you how to use Octave for a simple image processing application.
At the time of this writing, the latest stable version of Octave is 5.1.0. Unfortunately the graphical interface of Octave 5.1.0 is buggy on macOS and tends to freeze randomly. If you are OK with using the CLI interface of Octave, you can use version 5.1.0. See the second part of this article for a quick how to install and setup.
Since most Octave users will prefer the GUI interface, I will first show you how to install Octave 4.4.1, which seems to be more stable than 5.1.0 on macOS when used in GUI mode.
I assume that you have the Command Line Tools installed on your machine. If this is not the case, write the next command in a Terminal and accept the defaults:
The article consists of three parts:
At this time, there is no official installer for Octave for macOS. In order to install 4.4.1 we are going to use the Octave.app build. Go to the Download page and get the Current Release of Octave. You should end up with a file named Octave-4.4.1.dmg in your Downloads https://guideever158.weebly.com/mac-emulator-for-windows-10.html. folder.
Version 4.4.1 depends on OpenJDK 11.0.2+9 which you can get from the OpenJDKarchive. Make sure that you pick the exact version mentioned before. In order to install OpenJDK 11.0.2, open a Terminal and execute the next commands:
Once you’ve installed the required version of Java, you can proceed with installing Octave. Double click on the dmg file, accept the license and drag the app to your Applications folder. Since this is a third party unsigned build, first time when you start Octave you will need to right click the app and select Open.
You’ll also need to instruct Octave to use the GnuPlot graphics backend for plotting graphics. The default qt backend seems to be pretty buggy on macOS. In order to do this, you’ll need to create a .octaverc file in your home folder and put the next two lines in this file:
A simple way to do the above is to run the next commands in a Terminal
Restart Octave in order for the above to take effect.
At this point, you should be able to use Octave normally and use the menus to select the working folder, open, save files and so on. Go to the last part of this article if you want to see an example of using the app.
At this time, there is no official installer for Octave for macOS. In order to install 5.1.0 we are going to use the Homebrew package manager. If you don’t have Homebrew installed, you can install it by running the next command in a Terminal:
Onedrive for business mac os. Start by making sure that your Homebrew installation is up to date:
Finally, install Octave on your system:
The above command will take some time, because Octave depends on a lot of other libraries. Once the installation is finished, you can invoke the Octave interpreter with the octave command in a Terminal:
If you really want to start the GUI interface, keep in mind that, at least for version 5.1.0, this is pretty unstable, use:
You’ll also need to instruct Octave to use the GnuPlot graphical backend for plotting graphics. The default qt backend seems to be pretty buggy on macOS. In order to do this, you’ll need to create a .octaverc file in your home folder and put the next two lines in this file:
A simple way to do the above is to run the next commands in a Terminal
![Sierra Sierra](/uploads/1/3/3/8/133895013/470754504.png)
Restart Octave in order for the above to take effect.
At this point, you should be able to use the Octave CLI interface normally.
If you want to evaluate an existing Octave script, you can do it in a few ways. I’ll assume that you have a file named demo1.m in your current folder.
First start the interpreter and than run the script from an interpreter prompt:
The second option is to run the script when you start the interpreter and after the script is finished you will be back at the interpreter prompt:
Download Gnu Octave
If you just want to run a script and exit when done, simply use:
In the final part of this article I will show you how to install the Octave image processing package. This should work the same for Octave 4.4.1 or 5.1.0. Start Octave and write the next command at an Octave prompt:
The above will install the image package for Octave. You need to run this command only once after which it will remain installed on your system.
By default, Octave doesn’t load a newly installed package when you start it. In order to use an existing package, use the next command at an Octave prompt:
If you want Octave to always load an already installed package, add the load command to your .octaverc file, e.g. by running in a Terminal:
Next time when you will start Octave it will also load the image package.
Octave For Macbook Pro
Download clouds.jpg to your working folder and run the next script (I assume that you’ve already installed and loaded the image package):
This is what I see if I run the above script on my Mac in the Octave 4.4.1 app:
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