To fix this, do the following:
* Make a copy of python.exe
* Use that copy(!) to run 'update_manifest.py' that wxPython installed in you python folder
The problem is that by default a wrong DLL version is loaded, this causes crashes in the wxWidget C++ code. In Python 2.5 and earlier the presence of the python.exe.manifest (installed by wxPython) was enough to fix this, but Python 2.6 is compiled with internal manifests, so external manifest don't work. The script will update the internal manifest so the right DLL is loaded.
You need to use a copy of python.exe to execute the script, because otherwise the program is in use and cannot be updated. After updating the manifest the program should no longer crash on mouse-events (worked for me).
Wednesday, May 6, 2009
wxpython with python 2.6 crashes in Windows Vista
Solution found in: http://www.python-forum.org/pythonforum/viewtopic.php?f=4&t=11331#p54621
Friday, May 1, 2009
MATLAB: Multiplying with a Matrix Inverse
M-Lint has detected a call to inv in a multiplication operation.
The inverse of a matrix is primarily of theoretical value, and rarely finds any use in practical computations. Never use it to solve a linear system Ax=b with x=inv(A)*b, because it is slow and inaccurate.
Suggested Action
Instead of multiplying the matrix by its inverse, use matrix right division (/) or matrix left division (\). That is:
Replace inv(A)*b with A\b
Replace b*inv(A) with b/A
Frequently, an application needs to solve a series of related linear systems Ax=b, where A does not change, but b does. In this case, use lu, chol, or qr instead of inv, depending on the matrix type.
The inverse of a matrix is primarily of theoretical value, and rarely finds any use in practical computations. Never use it to solve a linear system Ax=b with x=inv(A)*b, because it is slow and inaccurate.
Suggested Action
Instead of multiplying the matrix by its inverse, use matrix right division (/) or matrix left division (\). That is:
Replace inv(A)*b with A\b
Replace b*inv(A) with b/A
Frequently, an application needs to solve a series of related linear systems Ax=b, where A does not change, but b does. In this case, use lu, chol, or qr instead of inv, depending on the matrix type.
Monday, December 22, 2008
Ubuntu: Change Default Applications in Firefox
Right clicking on a file of the same type and changing the default application via the properties does not help because GNOME default applications and system default applications are stored in two different lists.
To change the system default application (This will change the default application in Firefox):
1) sudo gedit /usr/share/applications/defaults.list
2) search and modify the line for appropriate file extension
To change the default application for GNOME:
1.a) sudo gedit /etc/gnome/defaults.list
2) search and modify the line for appropriate file extension
or
1.b) right click on file -> properties -> open with tab
To change the system default application (This will change the default application in Firefox):
1) sudo gedit /usr/share/applications/defaults.list
2) search and modify the line for appropriate file extension
To change the default application for GNOME:
1.a) sudo gedit /etc/gnome/defaults.list
2) search and modify the line for appropriate file extension
or
1.b) right click on file -> properties -> open with tab
Thursday, October 9, 2008
How To Compile OpenCV in Linux
How to compile C on Linux ?
- You need to setup the PKG_CONFIG_PATH variable. For example (assuming you are using a sh-based shell, like bash or zsh):
cd /where/you/have/the/source/code
You can check that the PKG_CONFIG_PATH is correct by doing either:
PKG_CONFIG_PATH=/where/you/have/installed/opencv/lib/pkgconfig:${PKG_CONFIG_PATH}
export PKG_CONFIG_PATHpkg-config --cflags opencv
You must have something like:
pkg-config --libs opencv$ pkg-config --cflags opencv
-I/where/you/have/installed/opencv/include/opencv
$ pkg-config --libs opencv
-L/where/you/have/installed/opencv/lib -lcxcore -lcv -lhighgui -lcvaux
How to compile and link some OpenCV based program on Linux ?
The best way is to use pkg-config. Just define the correct PKG_CONFIG_PATH:
PKG_CONFIG_PATH=/where/you/have/installed/opencv/lib/pkgconfig:${PKG_CONFIG_PATH}
And then, compile as below:
export PKG_CONFIG_PATHgcc `pkg-config --cflags opencv` `pkg-config --libs opencv` -o my-opencv-prgm my-opencv-prgm.c
Simpler way is as below:gcc `pkg-config --cflags --libs opencv` -o my-opencv-prgm my-opencv-prgm.c
If those two fails, try this:gcc -I/home/intel/opencv/include/opencv -L/home/intel/opencv/lib -lcv -lhighgui -lstdc++ \
-o my-opencv-prgm my-opencv-prgm.c
How to compile OpenCV with some libraries not in standard path on Linux?
The solution is to use the CFLAGS, CPPFLAGS and LDFLAGS environment variables at configure time. For example, if you have ffmpeg library in one of your own directories, you can do (all on one command line):
./configure CFLAGS=-I/where/is/ffmpeg/include CPPFLAGS=-I/where/is/ffmpeg/include LDFLAGS=-L/where/is/ffmpeg/lib
What if I get an error about OpenCV libraries when running a program?
If an error occurs that 'a library cannot be found' during compilation on Fedora systems:- create a file called opencv.conf in /etc/ld.so.conf.d/ which contains the path to your opencv libraries (by default /usr/local/lib).
- run ldconfig as root.
Wednesday, July 23, 2008
Shutdown Remote Desktop Windows Machine
run >> cmd >> shutdown
then follow the instructions.
then follow the instructions.
Labels:
remote desktop connection,
restart,
shut down,
windows
Sunday, June 29, 2008
Thursday, June 26, 2008
Saturday, June 14, 2008
Linux Directory name with a space
Example: The directory name is: "My Stupid Directory"
Access is as: "My\ Stupid\ Directory/"
Monday, May 26, 2008
Friday, May 23, 2008
Thursday, May 22, 2008
encoding xvid in linux from a sequence of images
xvid: you must specify one or a valid combination of 'bitrate', 'pass',
'quantizer' settings
'quantizer' settings
solution:
mencoder mf://*.png -ovc xvid -xvidencopts pass=1 -of avi -o
./tmp/filename.avi
or
mencoder mf://*.png -ovc xvid -xvidencopts bitrate=1600 -of avi -o
./tmp/deneme2.avi
convert multiple images from command line in linux (ubuntu)
sudo apt-get install imagemagick
convert '*.jpg' -resize 120x120 thumbnail%03d.png
more on the topic:
http://www.imagemagick.org/script/command-line-processing.php
Monday, May 19, 2008
Friday, May 16, 2008
Thursday, May 15, 2008
Open text file in python
file = open("sample.txt")
while 1:
line = file.readline()
if not line:
break
pass # do something
What this blog is
Sometimes we hit dead ends. We figure out the solution and move on. After a while we forget the fix but more often then not we find ourselves looking for the exact same solution. This blog is my notepad for these hacks. It is a blog instead of a text file because it is cool to share.
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