# Questions tagged [octave]

GNU Octave is a high-level interpreted language, primarily intended for numerical computations.

47
questions

**0**

votes

**0**answers

8 views

### oct2py - python cannot recognise the generic octave functions

After installing oct2py, I tested tow examples provided in the package. It is fine for 'roundtrip.py'. But for 'test_datatypes.py', the error is 'polynomial undefined near line 54 column 15', which ...

**0**

votes

**0**answers

22 views

### Cannot install octave backages on Ubuntu 18

I have the latest version of octave installed. When I launch octave, I use the following command to try and install the "io" package I have in my Downloads folder:
pkg install Donwloads/image.tar.gz
...

**0**

votes

**0**answers

13 views

### Errors while using tensorlab with octave

In https://tensorlab.net/doc/installation.html#installation they say it's possible to use tensorlab with octave newer than 3.8 . I use 5.1.0 and have a problem with:
>>H = hankelize(1:7,'full',...

**0**

votes

**0**answers

26 views

### Gaussian Reduction with Partial Pivoting in Octave / Matlab

I am trying to get an algorithm from an old math book I have to work properly. The book is Cullen, Introduction to Numerical Linear Algebra. Algorithm 2.3.
function B = gaussian2 ( A )
B = A;
%...

**0**

votes

**0**answers

36 views

### Octave filter design tool

It is easy to start the filter design tool from the gnu radio companion. If I use octave without gnu radio companion, how should I start the filter design tool from GUI (or Octave command window)?
In ...

**0**

votes

**1**answer

500 views

### Octave GUI doesn't come up on windows 10 x64

(A) I installed Octave 4.4.1 on my machine running Windows 10 x64 version. I installed it at d:\Octave.
(B) When I click the desktop shortcut "GNU Octave (GUI)" after installation, it opens up Octave....

**0**

votes

**1**answer

19 views

### Remove description / information when starting octave

Everytime I run octave, the following description/information displays on the screen, is there anyway the following doesn't shows up..
{
GNU Octave, version 3.8.1
Copyright (C) 2014 John W. Eaton ...

**0**

votes

**1**answer

182 views

### I can not find the octave.exe after installing octave

When installing oct2py library on Python, I was required to have GNU Octave installed in my path, in another word, setx PATH "%PATH%; where the folder has the file “octave.exe”.
However, I can not ...

**1**

vote

**1**answer

565 views

### How do I start Octave GUI from zip file install

I downloaded windows 32 zip file version of Octave from here
I do not want to use the installer to fully install Octave and would prefer to use it through the zip file extraction
I can start ...

**0**

votes

**1**answer

322 views

### Matlab/Octave Solving Matrix Using Gauss Seidel not Converging

Something totally impossible is happening. I have run the following code multiple times on the same Matrix and always converged to a solution using the Gauss Seidel method within 10 iterations.
My ...

**2**

votes

**1**answer

2k views

### Suppress “qt5ct: using qt5ct plugin” message

Every time Octave draws a figure (eg graph), I get the following message:
qt5ct: using qt5ct plugin
How do I suppress it?

**2**

votes

**1**answer

1k views

### Blank command prompt in Windows using Octave

I'm using Octave 3.6.4 on Windows 10. All appears to be working ok, except there's no command prompt.
I know that you can Customize the prompt using PS1, but that still leaves it blank.
Here's a ...

**0**

votes

**1**answer

1k views

### How to run Octave scripts from bash?

pavel@pavel-VirtualBox:~/projects/csv_converted$ sh plot.sh
plot.sh: 2: plot.sh: Syntax error: "(" unexpected
pavel@pavel-VirtualBox:~/projects/csv_converted$ ./plot.sh
'usr/bin/octave-cli: invalid ...

**0**

votes

**1**answer

108 views

### Where do I find a live CD with octave?

I'm working on a project involving octave. It's difficult to tie up my work computer with running the calculations so I thought to do it on an old laptop. That computer doesn't have an OS currently so ...

**0**

votes

**1**answer

61 views

### Viewing exacution of a single file in GNU Octave (echo fcnname on)

Question is simply: in MATLAB, you could simply use echo myFun on to set the echo status of a single function m-file to on, which then shows you each of the lines executed.
In GNU Octave, however, ...

**0**

votes

**1**answer

945 views

### Installing Octave-4.0.0 on CentOS yields QtOpenGL linking error

I am in the process of trying to install Octave-4.0.0 on a CentOS 6 cluster. Octave has 20+ dependencies, and it is unclear which versions of each dependency to use. Since yum only has Octave-3.4.3, ...

**2**

votes

**2**answers

3k views

### Adding Octave 4 (CLI) to system path variable (Windows 10)

I installed Octave 4 (from here) which has both a GUI and a CLI.
However, Octave doesn't seem to be added to the PATH variable, so typing octave or octave-cli into the command line doesn't do anything....

**1**

vote

**1**answer

413 views

### Installing pstoedit via macports is failing

I'm in the process of installing octave through macports (which btw was a huge pain in the afternoon), after it compiled for nearly a day, macports is installing some last dependencies, one of them is ...

**1**

vote

**1**answer

2k views

### Show Octave plot from shell script

If I invoke Octave to plot something, it needs the interactive prompt to stay running and show the plot.
When running from the command line, the --persist option will force Octave to keep open after ...

**0**

votes

**2**answers

1k views

### Creating a program shortcut that runs octave through cmder

In response to a previous question (Adding keyboard shortcuts for command prompt on Windows 7) I asked on this site I am now using cmder instead of command prompt as it is more user-friendly (as it ...

**0**

votes

**0**answers

446 views

### installing octave on OS X - get error and not sure how to fix

I have done a brew update && brew upgrade and
brew install octave --without-docs
afte a while I get:
patching file libgui/qterminal/libqterminal/unix/ExtendedDefaultTranslator_mac.h
...

**0**

votes

**1**answer

325 views

### Minimum packages required for Ubuntu Server to run Octave 3.8.x with GUI

I have a Ubuntu 14.0 server with no graphical interface. I created this server only to use Octave on it. Now that there is a GUI for the recent version of Octave 3.8.x available I wanna know what is ...

**0**

votes

**2**answers

412 views

### How to disabe the beep in Octave 3.8.0 GUI on Windows 7

The octave 3.8.0 experimental GUI is producing a warning beep in the console if, e.g. tab is pressed and there's no unique way to continue the typed command. How do I disable this beep?
Under 3.6.4, ...

**1**

vote

**1**answer

647 views

### Why does emacs start out with such a goofy tab spacing here?

This appears on a Linux version of emacs 24.3.1.
Fire up a buffer, enter octave-mode (you may need to install from package), and enter something like this:
function foo = bar(x,y)
Now, if you go to ...

**0**

votes

**1**answer

2k views

### Install octave using homebrew

I found a blog on how to do this here https://www.nesono.com/node/356 but when I do
brew install octave
I get
Error: No available formula for octave
I am on Mountain Lion 10.8.5

**-1**

votes

**2**answers

347 views

### PAGER('/dev/null'): permission denied

Setting PAGER to /dev/null as suggested through the net to prevent every command being printed in stdout issues an error under OS X 10.6:
octave:1> PAGER('/dev/null');
octave:2> 1
sh: /dev/null:...

**0**

votes

**1**answer

976 views

### Exporting plot as vector graphics in Octave or matlab

I know I can export a plot in octave as a PNG but is it possible to export a plot as a vector graphic image?
The reason I ask is that some of the points on my plot are very close together and I would ...

**1**

vote

**1**answer

533 views

### Switching between readline editing-modes in GNU octave

When punching away at the keyboard on the octave command line, I sometimes find that the various readline shortcuts stop working, e.g. C-a and C-e just insert ^A and ^E.
It took me a while to realize ...

**0**

votes

**2**answers

5k views

### Octave's sound() function

I apologize if this has been covered before but I am required to study Octave at my university. The way they're going through the exercises, they already assume that sound() works with Octave out of ...

**1**

vote

**0**answers

619 views

### Octave Install Error on Mac OSX 10.7.5 (using homebrew)

I am trying to install octave on my mac air
I have updated my homebrew, as is my XCode and its command line tools.
Here is the error I am getting:
==> Using Homebrew-provided fortran compiler.
...

**0**

votes

**0**answers

973 views

### How to input 64-bit hex values in octave

I'm trying to use Octave as a programmer's calculator. I want to input a 64-bit pointer, but when I do apparently the 64-bit value gets silently truncated to 32-bit:
octave:44> base_ptr=...

**1**

vote

**3**answers

244 views

### Software to draw graphics with millions of “measurements” [closed]

In my trading software I generate a file like the following:
10:00:00.0000001 1.25333
...........................
...........................
14:58:48.5024961 1.23456
14:58:48.5024987 1....

**2**

votes

**1**answer

466 views

### In what (small) ways can I modify Octave's compile options to enhance it without breaking it?

If the title to this question seems a bit vague, I am sorry. But I wasn't sure how to distill what I am attempting to do into a single sentence.
A few weeks back I learned that I could build and ...

**1**

vote

**2**answers

1k views

### Can I install Octave under Windows 7 without admin rights?

Can I install Octave under Windows 7 without admin rights? There are similar questions on Linux, but this is about Windows 7.

**1**

vote

**1**answer

738 views

### Package dependency error message when install octave on RedHat linux

Hi I tried to install octave on my RedHat 5 Linux. I typed command as
yum install octave
Then, it complained as following :
gcc-gfortran-4.1.2-44.el5.x86_64 from installed has depsolving problems
...

**3**

votes

**2**answers

4k views

### Software GNUPlot not launching from GNU Octave

I'm trying to launch GNUPlot from Octave, but when I do I get the following error:
octave-3.4.0:3> plot(x,y)
dyld: Library not loaded: /usr/X11/lib/libfreetype.6.dylib
Referenced from: /usr/X11/...

**5**

votes

**2**answers

11k views

### How do I run a Linux shell command from Octave?

I want to run commands like pdflatex and cp from an octave script. Is there a way to do that?

**3**

votes

**1**answer

239 views

### Conditional variables depending on whether Matlab or Octave is running the code

I have written some code for Matlab/Octave. Basically, they have the same syntax and everything, but, for example, they have different functions for optimization (linprog/glpk,quadprog/qp).
I want ...

**1**

vote

**0**answers

1k views

### Installing Octave on Red Hat

I am trying to reinstall Octave on Red Hat. I currently have Octave 2.4 installed on the computer, but it is too old and some of my scripts are not running.
On the Octave wiki it says:
Octave is ...

**8**

votes

**1**answer

395 views

### Why does the expression exp(i*pi) return the wrong result in GNU Octave?

I started to learn GNU Octave today, and tried the first expression given in the manual
exp(i*pi)
The result is
ans = -1.0000e+000 + 1.2246e-016i
And it seems GNU Scientific Library gives similar ...

**1**

vote

**1**answer

6k views

### Completely remove/ uninstall Octave from my mac machine

Does anyone have any idea how I can completely remove/delete/uninstall all trace of Octave from my mac machine? Preferably via Terminal in a very swift action?
Thanks,

**4**

votes

**3**answers

3k views

### 3D plotting in Ubuntu

I have Ubuntu 10.10 installed and need to plot 3D graphic.
I have installed several free applications available in the repository, like QtiPlot and GNU Octave. I have found out and created the ...

**2**

votes

**2**answers

7k views

### Displaying a sequence of images in Linux

I'm generating a sequence of images saved as .PNG files on disk, labelled say plot001.png, plot002.png, plot003.png. These are actually saved plots from Octave, a scientific data manipulation/...

**1**

vote

**1**answer

191 views

### Octave: refer to output like %10 in Mathematica?

I want to reuse values. Is there a similar functionality as %10 of Mathematica in Octave?
octave:18> 3/log (2)
ans = 4.32808512266689
octave:19> % //how to output 4.328....
...

**0**

votes

**1**answer

2k views

### Octave: Precise value in Decimal or Continuous Fraction for 729 / 4^3 [closed]

I get the approximation:
>> 729 / 4^3
11.391
Is there some function to get more precise approximation?

**3**

votes

**3**answers

3k views

### How to do binary decimal calculations with bin2dec

What is the Octave NaN for? Is dot wrong delimiter?
>> bin2dec ('10.1')
ans = NaN

**0**

votes

**2**answers

3k views

### GNU Octave: How to change base from DEC to BIN?

I need to do many binary calculations of the form:
10.1^(1/11) base 2
10.001^(1/11) base 2
10.0001^(1/11) base 2
10.00001^(1/11) base 2
10.000001^(1/11) base 2
...
where 1/11 base 2 = 1/3 base 10.
...