I have downloaded this code;
http://www.cs.sfu.ca/%7Emori/research/superpixels/superpixels64.tar.gz
In the readme file, it says;
Run mex -largeArrayDims on *.c in yu_imncut directory
-largeArrayDims is needed for 64bit architectures (thanks to Richard Lowe for providing fixes for 64bit MATLAB)
Obtain mfm-pb boundary detector code from
http://www.cs.berkeley.edu/projects/vision/grouping/segbench/
Change path names in sp_demo.m and pbWrapper.m
Get a fast processor and lots of RAM
Run sp_demo.m
I tried to do the mex -.. one but it told me that I don't have any compiler. How can I fix this? Can you please help me with this? I am using 64 bit Windows 7
As far as I know GCC for Windows is not supported by Matlab. Visual Studio Express Editions will work, but 2010 may require a patch dependent on the version of Matlab you are running (http://www.mathworks.com/support/compilers/R2011a/win32.html). This page lists all supported compilers for Matlab.
Here's a link to GCC for windows
http://gcc.gnu.org/install/specific.html#windows
Related
I have download that code from github.
Whenever that code tries to check mexopencv (a file inside lib folder). It shows an error on Matlab 2017a that is:
[error 3] please make sure gcc >= 4.4 g++ >= 4.4 is installed ...
I am having a gcc version of 8.8.0
Following is the description of system
Window 10
Visual Studio 2012
Matlab 2017a
opencv 2.4.10
mexopencv (install from your folder LIB)
You might lack of standard libraries (.dll in Windows but .lib in Linux). The code was developed under Linux (help is also only provided for Linux systems) and once tested under Windows 7.
The method was tested under OS linux lubuntu 14.04, CPU intel i5 and
16GB of RAM. This guide was written under a linux-based distribution
scope, more precisely debian. Unfortunately we lack experience to
address bugs or any problem that could emerge in non-linux OS, we will
provide only linux OS help regarding execution problems, we apologise.
we tested this code on Windows7. We successfully installed opencv
2.4.10 following this tutorial: [http://www.learnopencv.com/install-opencv3-on-windows/]
This suggests that the mex-function is also linux-based. The error should vanish if you compile the source code yourself on your system, e.g. with MinGW (also GCC), see here.
EDITED:
the README.markdown file (under LIB/mexopencv-master.zip) provides a little guide through the installation process of both, openCV and the mexopencv function for unix (including ubuntu 14.04) and Windows systems. The latter states:
Browse to mexopencv root folder, and type the following in the MATLAB
command window:
>> mexopencv.make
By default, mexopencv assumes the OpenCV library is installed in
C:\opencv. If this is not the case, specify the path as an argument:
>> mexopencv.make('opencv_path', 'c:\your\path\to\opencv')
Note that if you build OpenCV from source, this path specification
might not work out of the box. You need to replace dll files in the
OpenCV package with newly built binaries. Or, you need to modify
+mexopencv/make.m to correctly link your MEX-files with the library.
To remove existing mexopencv binaries, use the following command.
>> mexopencv.make('clean', true)
It requires a standard C++ compiler supported by Matlab (see here), any Visual Studio installation should be OK, as an open-source option MinGW is recommended. Just remember to pick the right system (usually 64-bit).
I use MATLAB 2012a. I need to compile a mex file in my program. Everything works fine with Microsoft SDK 7.1 but I need a minor compiler in order to work my program in other computers. Suggested compilers on MathWorks website are compilers that need to be installed as packages. Is there any compilers that work stand-alone and don't need to be installed?
You can use MinGW, but it is not straightforward. See this Q&A. The accepted answer suggest to compile and link MEX files outside of MATLAB, which is fine, but it's simple to just create mexopts.bat to do this.
A good mexopts.bat for MING is hosted here. Pick a MINGW distribution from win-builds and set the paths in mexopts. Then you can use mex -setup with this file.
gnumex is a disaster, IMO.
i installed two compilers in Matlab : LCC and Visual C++ 2008
i want to load a C++ header file in matlab but when i want to do this matlab uses LCC instead of
Visual C++ and gives me some warnings .
i used:
mex -setup
mbuild -setup
but Matlab still uses LCC for loading my C++ header file
>> loadlibrary('DLLing.dll', 'DLLTutorial.h')
Warning: Message from C preprocessor:
lcc preprocessor error: C:\Users\MAHNAZ\Documents\MATLAB\DLLTutorial.h:3 Could not find include file
How can i say to Matlab that use visual c++ compiler instead of LCC??
What version of MatLab are you using? It might not suppose the version of the Microsoft SDK you have installed on your computer. This isn't really an answer but I can't post comments yet.
As per your description, after you type mex -setup, the first thing MATLAB should ask you:
Please choose your compiler for building external interface (MEX) files:
Would you like mex to locate installed compilers [y]/n?
After this, you should press y and then you should see a list of available compilers. Choose a right one from them.
What version of Windows are you working with, is it 32 or 64 bit (question for both Windows and the MATLAB version installed)?
Looking the archived documentation for R2008a (you must be logged in to see the page), it seems that LOADLIBRARY requires VS2005 on 64-bit platforms (perhaps it defaults to LCC if its not available). The truth is it does not explicitly say how it determines what compiler to use. (If you are up to it, you can edit loadlibrary.m and trace the execution to see why it ends up calling LCC instead of Visual C++)
Compare this with the current R2012a help page where it clearly says that you must select the compiler with mex -setup.
Note that LCC compiler will no longer be shipped with future versions.
I would like to write a CMakeLists.txt such that CMake writes a Visual Studio 2010 (64 bit) solution file to build a mex function for MATLAB R2011a (64 bit) from C++ code example.cxx.
I do not want to use MATLAB's compiler wrapper mex but set up the Visual Studio solution file such that Visual C++ links the relevant MATLAB libraries.
example.cxx has no dependencies except for the MATLAB libraries that are necessary for mex files.
CMake 2.8.7 is set up correctly such that it uses the 64 bit generator for Visual Studio 2010.
The essence of what I am doing right now is
find_package(Matlab)
add_library(example STATIC example.cxx)
target_link_libraries(example ${MATLAB_LIBRARIES})
Neither the compiler nor the linker issues any errors. I install the output example.lib under the name example.mexw64 in a directory in MATLAB's path. When I call example from MATLAB, I get the error message
??? Invalid MEX-file
'C:\...\example.mexw64':
C:\...\example.mexw64 is not a valid Win32 application.
Any suggestions are welcome!
I had the same problem and this link was very helpful (also serves as a nice example of how to use ITK in a MATLAB MEX file btw). I think for your case, you need to add the link flag "/export:mexFunction" to your CMakeLists.txt file. Example below:
PROJECT(example)
FIND_PACKAGE(Matlab REQUIRED)
INCLUDE_DIRECTORIES(${MATLAB_INCLUDE_DIR})
ADD_LIBRARY(example MODULE example.cpp)
ADD_DEFINITIONS(-DMATLAB_MEX_FILE)
# Needed for entry point.
SET_TARGET_PROPERTIES(example
PROPERTIES
LINK_FLAGS "/export:mexFunction"
)
# Change the dll extension to a mex extension.
set_target_properties(example PROPERTIES SUFFIX ".mexw64")
TARGET_LINK_LIBRARIES(example ${MATLAB_LIBRARIES})
Note that the FIND_PACKAGE(Matlab) doesn't seem to work all that well, so that may be a problem for some people. I had to get around it by hard-coding the MATLAB paths into CMakeLists.txt (not shown in this example).
Matlab mex files are dll`s not libs. Try making cmake (not an expert on that) create a dynamic librartŘ not static.
I have a set of facial features that i have obtained and would like to classify using SVM. I intend to use libsvm package and use MATLAB to carry out the training.I have already read up on SVM by watching the Stanford lecture. But I am not sure how to use libsvm to start.. Need some guidance...
In matlab you can link your matlab code with some programs implemented in c. This a called a mex-file.
However you need to compile them, to make it work.
You can read the readme file to know how to compile them:
Installation
On Unix systems, we recommend using GNU g++ as your compiler and type
'make' to build 'svmtrain.mexglx' and 'svmpredict.mexglx'. Note that
we assume your MATLAB is installed in '/usr/local/matlab', if not,
please change MATLABDIR in Makefile.
Example:
linux> make
To use Octave, type 'make octave':
Example: linux> make octave
On Windows systems, pre-built binary files are already in the
directory `..\windows', so no need to conduct installation. Now we
include both 32bit binary files and 64bit binary files, but in future
releases, we will provide binary files only for 64bit MATLAB on
Windows. If you have modified the sources and would like to re-build
the package, type 'mex -setup' in MATLAB to choose a compiler for mex
first. Then type 'make' to start the installation.
Example:
matlab> mex -setup
(ps: MATLAB will show the following messages to setup default compiler.)
Please choose your compiler for building external interface (MEX) files:
Would you like mex to locate installed compilers [y]/n? y
Select a compiler:
1 Microsoft Visual C/C++ version 7.1 in C:\Program Files\Microsoft Visual Studio
[0] None
Compiler: 1
Please verify your choices:
Compiler: Microsoft Visual C/C++ 7.1
Location: C:\Program Files\Microsoft Visual Studio
Are these correct?([y]/n): y
matlab> make
For list of supported/compatible compilers for MATLAB, please check
the following page:
http://www.mathworks.com/support/compilers/current_release/