I'm trying to use luagraph, a binding to the graphviz library:
http://luagraph.luaforge.net/index.html
To install, I'm using luarocks in Mac OS X. The following command is executed in bash:
luarocks install luagraph
The output is the following:
Installing https://luarocks.org/luagraph-1.0.4-1.src.rock... Using
https://luarocks.org/luagraph-1.0.4-1.src.rock... switching to 'build'
mode
Error: Could not find expected file graphviz/graph.h, or
graphviz/graph.h for GRAPHVIZ -- you may have to install GRAPHVIZ in
your system and/or pass GRAPHVIZ_DIR or GRAPHVIZ_INCDIR to the
luarocks command. Example: luarocks install luagraph
GRAPHVIZ_DIR=/usr/local
I have been installed graphviz using homebrew, but I can't figure out how to pass GRAPHVIZ_DIR or GRAPHVIZ_INCDIR properly.
How can I install luagraph?
I've updated LuaGRAPH a couple of weeks ago. It now supports the newest version of Graphviz based on the cgraph library instead of the old graph library.
There is one drawback: I couldn't get luagraph to run on Windows using mingw because of some runtime library issues (compiler and dll compatibility probably). Please look at the README file for more details.
I personally never produced a rockspec for this module. This was created by someone else based on a fork of my luagraph library.
Installation without Luarocks is simple. Download from
https://github.com/hleuwer/luagraph
and follow the instruction in the documentation and the README file. You need adopt a simple config file which is included by make.
Herbert
Well, luaGRAPH is still the top result when searching for lua and graph. So the question is still standing.
And, unfortunately, the answer is: luagraph is OLD, the last update happened before the ubuntu 14.04 was released. And there seem to be some notable changes in the system itself, the flags the error message show do not seem to work. On top of that, graphviz is now about 20 releases newer than the luarock recommends.
There now is a bare bone alternative lua package: graphviz
It is extremely basic, and documentation in not at all informative, but at least it works.
update: Luagraph may be working again, but not through rocks. See the other answer.
Related
I need to update opencv to version 4.5.1 because there is a function that is not implemented in my current version 3.4.2. (I need to use the SIFT_create function, when I google a bit it seems that they removed it from 3.4.2 because of a patent. However, I have also heard from someone that this function has a different name in 3.4.2, so if you know this different name this is fine as well. I googled it but couldn't find anything about it.)
I tried updating opencv in the anaconda navigator but that didn't work. I tried typing
pip install opencv-python==4.0.0.21
(if I replaced 4.0.0.21 by 4.5.1 it couldn't find the version), but when I type
cv2.__version__
afterwards it still says I'm using version 3.4.2. I found this post: How to upgrade OpenCV in Anaconda (windows)? which says I should use
conda install -c conda-forge opencv=4.3.0
I do this, both the exact same command and the command with 4.3.0 replaced by 4.5.1 but in both cases I only get version 4.0.0 (which apparently also doesn't have the SIFT_create function).
Any idea what I could do?
In the meanwhile I found the answer myself (or rather: with the help of non-internet people).
The problem was that while trying to update opencv, I ended up having two versions of opencv at once. I had opencv 4.5.1 and at the same time I had opencv-python 4.0.0.21 installed. When importing opencv, it chose to import opencv-python in stead of just opencv. When I deleted the opencv-python this fixed the problem.
I have some problems following the tutorial "http://wiki.ros.org/Industrial/Tutori...". I have installed ROS Melodic and i want to use an slave ethercat like the "IO rack: EtherCAT Couper, 8 DI, & 8DO (all Beckhoff)" but different brand (Omron), and when i try to follow the step 1: Install OROCOS toolchain for ROS it return a error when i follow the tutorial "http://wiki.ros.org/orocos_toolchain" and execute the command "rosdep install orocos_toolchain" the error is the next: ERROR: Rosdep cannot find all required resources to answer your query Missing resource orocos_toolchain.
I use ROS 1 Distro: melodic SO: Ubuntu 18:04
Someone can i help me, please. I was searching another ways to install OROCOS toolchain but i didn't have success.
Most of the readily available documentation for installing / using Orocos is out of date. For example, that page you were at is (at timeof writing) 6 years old, for an end-of-life distro.
The up-to-date info is on their github and website (The website, for you right now, is probably less useful, but this page still is). Respectively, you should now install that fat stack as sudo apt install ros-melodic-rtt-ros-integration, aka install from binary sources. Make sure to pay careful attention to Building ROS-Based Orocos Components, because they have their own system which changes the CMake process. There's also other packages that they/others keep from other stacks, you can see the whole list by trying to autocomplete apt install ros-melodic-rtt-
So I've been searching everywhere and I'm completely stuck right now. Initially I just installed the binaries which came with luarocks.exe and luarocks_admin.exe but with that there was no config file so when I go to install the luarocks-mysql module, luarocks was unable to find the lua library and said I needed to set the LUA_LIBDIR variable in the config. I can't make changes to the luarocks config though because it either doesn't exist or I can't find it.
After getting this problem I went back to install the luarocks all in one package but I'm unable to follow the instructions because I can't find the install.bat file that they were talking about. Sorry if this is a lot but I'm just running into a bunch of problems right now.
EDIT: Just use Ubuntu, it's 100 times easier.
I had similar problems. I didn't look for a solution and just installed wsl on windows 10.
https://learn.microsoft.com/en-us/windows/wsl/install
Then execute the commands in the console:
sudo apt install lua5.3 liblua5.3-0 liblua5.3-dev
sudo apt install luarocks
I am a complete newb to lua, but so far I like it.
I want to install love because it provides a nice framework and want to explore its features. I can already run lua scripts (luarocks comes with lua5.1.) and I have the zerobrain IDE. I installed socket.rock by getting the .rock file and running:
luarocks install luasocket-2.0.2-3.win32-x86.rock
But I can't find a similar file for love. I found this website: luarocks-love, which tells me:
luarocks install --server=http://luarocks.org/m/love <name>
So I can run this, but I don't know what <name> means... I tried it without <name> and I get an error. Can someone explain what I am missing here?
Thanks!
You can't install Love via luarocks. Love isn't a library.
The installers for Windows are available here.
What you have there is just used for installing libraries using luarocks that depend upon Love. It is not the framework itself.
I already have part of a program running in Python 3 but I need OpenCV (or SimpleCV), for a robotic vehicle, but I haven't found any install commands that seem to work, other than for Python 2.7.
If it is compatible could you please include instructions (/links to) for installation of the module?
I am using Ubuntu 14.
Maybe a little late to answer, but it's actually supported on OpenCV version 3 (in alpha state nowadays). I have successfully managed to install it, on MacOS, but I guess it would be similar on Ubuntu.
Now you have separated options for python2 and python3 when using Cmake. So you'll have to set those to make it work. That's all I needed to set:
BUILD_opencv_python3
PYTHON3_LIBRARY
PYTHON3_INCLUDE_DIR
PYTHON3_INCLUDE_DIR2
PYTHON3_NUMPY_INCLUDE_DIRS
...
Here you can find more detailed description: Link
Luigolas is correct that OpenCV 3.0 supports Python 3.x bindings. It was in release candidate status since April and the production version was released on 4 June 2015. Unfortunately for some reason the downloadable installation program on the OpenCV site does not contain a Python 3.x-compatible cv2.pyd file.
OP asked about Ubuntu but for those requiring a Windows installer, use Christoph Gohlke's site, which maintains Windows binaries for many Python packages, including OpenCV 3.0 with Python 3.x bindings. Visit:
http://www.lfd.uci.edu/~gohlke/pythonlibs/#opencv
To install, just download the 64-bit or 32-bit .whl file appropriate for your system, then run pip install [filename]. Then the instruction import cv2 should work in your Python 3.x interpreter.