When Octave starts up, it prints out
GNU Octave, version 4.2.1 Copyright (C) 2017 John W. Eaton and others.
This is free software; see the source code for copying conditions.
There is ABSOLUTELY NO WARRANTY; not even for MERCHANTABILITY or
FITNESS FOR A PARTICULAR PURPOSE. For details, type 'warranty'.
Octave was configured for "x86_64-pc-linux-gnu".
Additional information about Octave is available at
http://www.octave.org.
Please contribute if you find this software useful. For more
information, visit http://www.octave.org/get-involved.html
Read http://www.octave.org/bugs.html to learn how to submit bug
reports. For information about changes from previous versions, type
'news'.
Is there a way to turn off this printout? I don't need to read it every time I start Octave.
Use the quiet option, like so:
$ octave --quiet
octave-4.3.0+>
From the command line options section in the manual:
--silent
--quiet
-q
Don’t print the usual greeting and version message at startup.
Related
I'm using NixOS as the distro on WSL (via the excellent setup provided by Trundle: https://github.com/Trundle/NixOS-WSL) and I'd like to install the racket package. If I run nix-shell -p racket, it dutifully downloads (or uses the previously downloaded) the pre-built binary and I can use it just fine. But if I add racket to the environment.systemPackages list in configuration.nix and try to nixos-rebuild test, it starts trying to build things from source. It fails when it gets to gtk (presumably because WSL2 doesn't yet support graphical applications).
Why the difference in behavior? Is there a way I can convince NixOS to use the pre-built racket when filling out the systemPackages? Happy to post my configuration.nix if it would help the diagnosis, though it's really not much of a departure from Trundle's.
I found in QEMU NIOS IP https://wiki.qemu.org/Documentation/Platforms/Nios2
I have downloaded intel tool chain from their website : https://www.intel.com/content/www/us/en/programmable/products/boards_and_kits/dev-kits/altera/kit-niosii-2s60.html
I have few questions:
Is the NIOS2 in QEMU IP matching intel’s NIOS IP ?
What is the toolchain you use to compile and run it in QEMU ? Is it same tool-chain as provided by intel’s website ?
How to general Firmware code and run it on NIOS over QEMU. In the Wiki it says:
qemu-system-nios2 -M 10m50-ghrd -kernel -dtb -nographic
How to generate dtb file for it?
Do we need to take products created by the quartos/EDS for the running of the QEMU, other from the compiled binary? (DTB - board specification?)
Do we need to run it with specific QEMU parameters/arguments ?
Do you have code examples for NIOS using its peripherals?
Basically, I didn’t find any documentations/examples about how to use the NIOS2 in QEMU. Can you help with some additional info ?
Even some basic “hello would” (compile and run in QEMU) would be great…
UPDATE: the most up-to-date answer to this question may be to analyse the linux console nios test at https://gitlab.com/qemu-project/qemu/-/blob/master/tests/acceptance/boot_linux_console.py#L1029 (or of course contact a maintainer). The kernel image from advent calendar 2018 day 14 runs great. It looks like it can all be done with buildroot.
My comments started bearing fruit, so I'll try to put a partial answer together. I haven't gotten this to work yet, but maybe this can be helpful to others who might work farther.
NOTE: If you just want to run a single nios2 binary, you can pass it straight to qemu-nios2. qemu-system-nios2 is for running linux.
I believe the qemu behavior is functionality rather than intellectual property. It would be a bug if it mismatched. I do not know whether it does. Mentioning IP here, please remember that open source projects are generally run by a handful of vulnerable caring devs who usually have no legal team if ownership of intellectual property is challenged. If there's an issue, it would be polite to refer the concerning party to https://eff.org/ who often legally represents such things.
I expect that any nios2 toolchain works. Here's a toolchain from a quick internet search that led me to bootlin.com. Appears to include instructions on how to duplicate it from source.
See 4
Here is what I have so far for firmware generation:
# set up a toolchain (note: this old step is redundant with buildroot, lower down, which also installs a toolchain and even builds a kernel if asked)
wget https://toolchains.bootlin.com/downloads/releases/toolchains/nios2/tarballs/nios2--glibc--stable-2020.08-1.tar.bz2
tar -jxvf nios2--glibc--stable-2020.08-1.tar.bz2
# get kernel sources (pass --depth 1 to speed up)
git clone https://github.com/altera-opensource/linux-socfpga.git
# build kernel and device tree
cd linux-socfpga
make ARCH=nios2 CROSS_COMPILE=$(pwd)/../nios2--glibc--stable-2020.08-1/bin/nios2-linux- 10m50_defconfig 10m50_devboard.dtb vmlinux -j5
cd ..
# kernel is now at linux-socfpga/vmlinux
# device tree is now at linux-socfpga/arch/nios2/boot/dts/10m50_devboard.dtb
# set up buildroot to build a root image
git clone https://github.com/buildroot/buildroot.git
cd buildroot
# configure for qemu nios2
make qemu_nios2_10m50_defconfig
# build root image
PERL_MM_OPT= LDFLAGS= CPPFLAGS= LD_LIBRARY_PATH= make
cd ..
# rootfs images are now in buildroot/output/images/
I'm afraid I'm just a visitor and I don't know who quartos/eds are or what compiled binary you are referring to.
The qemu command line appears to be qemu-system-nios2 -M <machine> -kernel <kernel file> -dtb <dtb file> <rootfs image file>. The example machine is 10m50-ghrd which we built the kernel for above, and this may be the only one.
not yet! i'll try to update this answer if i get farther. feel free to edit it if you get farther.
I want to install FEATool on Octave 4.2.2. Therefore, I went through these steps:
Downloading it.
Trying pkg install FEATool-Multiphysic.tar.gz in Octave command-line interface.
Octave returns this error:
COPYING file missing.
Neither GitHub nor FEATool provides any installation file for Octave or instructions about doing it.
Therefore, the question is:
How to install FEATool on Octave (Ubuntu 18.04)?
Following a quick preliminary check, it seems that the FEATool is no longer available or compatible with Octave since FEATool v1.10.
While there was no explicit announcement for this either on their blog or changelogs, according to the main author of the software (as elicited below), this seems to relate to overhead involved in supporting Octave on top of Matlab. Furthermore, as the company seems to have effectively chosen (for their own good reasons, I'm sure) to intentionally follow a direction that explicitly breaks Octave functionality, it cannot be expected to work on this platform even as unsupported software. Therefore the answer to your question is that "no you can no longer install this tool on octave (ubuntu or otherwise)".
Evidence that this software is no longer available for, or compatible with Octave:
Mentions to Octave in the documentation from v1.8 have now disappeared and are exclusive to Matlab (with extra effort towards Matlab backwards compatibily)
The .tar.gz package is no longer an Octave-compatible package.
The main code relies on .p files, which obfuscate the code and are unsupported in Octave
Past releases and source code have disappeared and are no longer available for download, both from sourceforge, official website, and github. Therefore it is not possible to download the octave-compatible v1.8 of the tool either.
I've the expect script running on linux which I want to run it on windows. I've added
#!/bin/sh
# \
exec tclsh "$0" ${1+"$#"}
package require Expect
lines as well at the start. I'm getting 'can't find package Expect' error. where can I get that?
Expect for Windows is done by ActiveState as part of ActiveTcl (no charge for the 32-bit version), which is highly recommended as the definitive batteries-included build of Tcl on the Windows platform. (I'm not sure if Expect for Windows is part of the Community Edition; I'm on a different platform so checking is a little awkward.)
Be aware that there are some substantial differences between Unix and Windows under the covers, and Expect is an extension package that gets very deep into the details. It hides nearly all the horrible differences, but not all; advanced scripts may need quite a bit of extra work to port. Also, some Windows executables (notably telnet.exe) can't be wrapped by Expect because they're marked as special system files, and GUI apps can't be wrapped at all. There are often good alternatives for subordinate processes though.
I would like to calculate the following symbolic expression in GNU Octave:
int(exp(ikx-|k|^n),k,-infinity,infinity) , (- it would a function of 'x' of-course, where 'x' is an array of data.)
I don't succeed.
I understood, searching a bit in the internet, that Octave does not come initially with a built-in 'Symbolic math' suite.
Is this true?
How do I download and install it (using Ubuntu 12.04, from the 'Terminal'?)?
Thanking u on advance!
Yes. GNU octave is the core program and language. What you are looking for are functions from the symbolic package that belong to Octave-Forge. They are two different but related projects. Let me remind you that the symbolic maths toolbox is also not part of Matlab core, it's a different product.
To install them in Ubuntu, it depends on how you installed Octave:
from the Ubuntu repositories? If so, sudo apt-get install octave-symbolic.
compiled it Octave yourself? Start Octave and at the Octave prompt pkg install -forge symbolic
from one of the up to date PPAs? Check if they also have the sybolic package and install that one
I can tell you in advance that the symbolic package has been unmaintained for a long time, and doesn't work very well with latest Octave versions (it was written for a very old version of Octave). The advice usually is to switch to Maxima which is designed exactly for that. Since 2015 the symbolic package is again actively maintained. However, Octave is still a programming language aimed at numerical computing. If all your problems require symbolic computations, then consider using a computer algebra system. Maxima is often recommended.