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• Gaussian smoothing in MatLab

  - by qpr92

  For an m x n array of elements with some noisy images, I want to perform Gaussian smoothing. How do you do that in MatLab? I've read the math involves smoothing everything with a kernel at a certain scale but have no idea how to do this in MatLab. Im pretty new to this...

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• Mixed declarations and code in open source projects?

  - by Eduardo

  Why is still C99 mixed declarations and code not used in open source C projects like the Linux kernel or GNOME? I really like mixed declarations and code since it makes the code more readable and prevents hard to see bugs by restricting the scope of the variables to the narrowest possible. This is recommended by Google for C++. For example,…

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• How can i alter CODE inside the .TEXT section at runtime of an iphone application?

  - by shapeless

  I need to Alter the CODE section of an iphone app from a CODE CAVE at runtime.. but the section is protected and i get a kernel exception, can i change the protection flags somehow?

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• Is $70/h is a good salary ?

  - by MikeJailrod

  Hi. One of my friends has contacted a company that is looking for good, linux network programmers in C, requiring a good background of the linux kernel and low-level network programming. The starting payment would be $70 per hour - I am still at college and honestly i don't know if that's a good salary for such a work as linux network…

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• Accessing PCI Device from user space programs

  - by crissangel

  I have a device which would be interface with my processor through pcie. I have written driver for it using the existing pci file operations. Now my problem is how do I access it from user space programs? PCI File operations do not have IOCTL support and hence I cant make an ioctl call unlike other char devices. I cannot use…

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• What alternatives to __attribute__ exist on 64-bit kernels?

  - by Saifi Khan

  Hi: Is there any alternative to non-ISO gcc specific extension __attribute__ on 64-bit kernels ? Three types that i've noticed are: function attributes, type attributes and variable attributes. eg. i'd like to avoid using __attribute__((__packed__)) for structures passed over the network, even though some gcc based code do…

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• 2d convolution using python and numpy

  - by mikip

  Hi I am trying to perform a 2d convolution in python using numpy I have a 2d array as follows with kernel H_r for the rows and H_c for the columns data = np.zeros((nr, nc), dtype=np.float32) #fill array with some data here then convolve for r in range(nr): data[r,:] = np.convolve(data[r,:], H_r, 'same') for c in…

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• How to create sandbox in C# for external process?

  - by SuitUp

  How to create sandbox in C# for external process? As sandbox i understand an environment for process i start from C#, that stop that process from interfering with anything else - kernel, system variables, system configuration, memory, registry, disk, hardware, location other than starting place and so on. I want place…

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• After Repo sync, there are no files int he directory.

  - by taranfx

  I've setup a new Repo for Android source code, and after executing the repo sync, there are no files in the repo directory. Did I miss something? I used: repo init -u git://android.git.kernel.org/platform/manifest.git repo initialized in /home/tarandeep/code/Android repo sync ... It downloaded GBs of data…

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• exec: 23: python: not found error?

  - by user364133

  im trying to build android from source on ubuntu 10.04. when i enter the repo command: repo init -u git://android.git.kernel.org/platform/manifest.git -b eclair it get this error back exec: 23: python: not found any ideas.

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• Windows MAchine Debugging

  - by PrettyFlower

  I've been learning how to program for Windows for some time now and am getting pretty comfy with COM. I had thought to go over to Linux and do some C++ programming there and I wished to run Rosetta Commons so I installed Fedora. I had tried installing Ubuntu a few months ago and things got messy. I had a glitch,…

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• Is it possible to restart the phone with Android SDK or NDK?

  - by J Andy

  Is it possible to programmatically restart the phone from a application (service) running on top of the Dalvik VM? If the SDK does not provide this functionality, then how about using the NDK and calling some functions provided by the kernel? I know this option is not preferred (not stable enough libs), but if…

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• Preventing threads from writing to the same file

  - by EpsilonVector

  I'm implementing an FTP-like protocol in Linux kernel 2.4 (homework), and I was under the impression that if a file is open for writing any subsequent attempt to open it by another thread should fail, until I actually tried it and discovered it goes through. How do I prevent this from happening? PS: I'm…

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• Graph of included files

  - by Dacav

  When I work on someone else's code, I tipically need to abuse of grep in order to find data types declarations etc, and this usually makes me confused. I'd like to have some tool which analyzes the source code and produces some graphviz-like drawing and allows me to follow dependencies. Also I've found…

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• Understanding the hardware of printf

  - by tipu

  I was wondering if there was any resources available online that explains what happens with something, like printf of C, that explains what's going on in the very low level (BIOS/kernel calls)

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• linux, LD_PRELOAD error

  - by user286215

  Hello, i am new in programming under linux and trying to get working this code: http://scaryreasoner.wordpress.com/2007/11/17/using-ld_preload-libraries-and-glibc-backtrace-function-for-debugging/ but getting error: "ERROR: ld.so: object 'libwrap_ioctl.so' from LD_PRELOAD cannot be preloaded: ignored." …

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• Question about a C macro expansion

  - by holydiver

  I generally have ignored using macros while writing in C but I think I know fundamentals about them. While i was reading the source code of list in linux kernel, i saw something like that: #define LIST_HEAD_INIT(name) { &(name), &(name) } #define LIST_HEAD(name) \ struct list_head name =…

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• Why is setscheduler not forcing need resched

  - by EpsilonVector

  I noticed that in Linux kernel 2.4 setscheduler doesn't force need_resched. Why is that? is it just some convention, or does that happens somewhere else?

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• Gaussian filter in Matlab

  - by md86

  Does the 'gaussian' filter in MatLab convolve the image with the Gaussian kernel? Also, how do you choose the parameters hsize (size of filter) and sigma? What do you base it on? etc

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• "blkclr (mach_kernel)" shows up in mac's shark profiler. What does it do?

  - by lh3

  I am profiling a C program using Mac's Shark which shows that some of CPU time goes to "blkclr" in "mach_kernel". What does this kernel function do? I speculate it is related to memory allocation, but I am not sure. I have googled for some time, but could not find the answer, either. Does someone…

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• Setting up 2 or more Repositories?

  - by user364133

  My question is: can i have 2 repositories without losing my original repository. Lets say i want the the eclair source repository repo init -u git://android.git.kernel.org/platform/manifest.git -b eclair (already synced and working) and i would also like to sync with cyanogens…

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• How to get PIDs that are using given file name in C#?

  - by TN

  How to get PIDs of processes that are using a given file name and mutex name? (Not by custom kernel driver, but in C# in user mode.) UPDATE: Thanks to Daniel Renshaw I found a script that lists all handles with PIDs. (Using a not undocumented and unfrozen functions.)

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• Reading a SquashFS archive

  - by p-static

  (SquashFS is a compressed filesystem - http://en.wikipedia.org/wiki/SquashFS) I'm looking for a way to read a SquashFS filesystem from a program. So far, I've know about the in-kernel drivers for it, but I'm sure that a userspace library for it must exist somewhere. Any language would be…

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• Is it possible to unpage all memory in Windows?

  - by Hack59

  I have plenty of RAM, however, after starting and finishing a large number of processes, it seems that most of the applications' virtual memory has been paged to disk, and switching to any of the older processes requires a very long time to load the memory back into RAM. Is there a way,…

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• what is exactly an EOF?

  - by mebius

  is EOF a special byte sequence that lies in the end of every file, or is it kinda exception(interrupt) that is notified by the kernel?

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