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  • In need of a good MATLAB class tutorial

    - by rlbond
    I'm having a lot of trouble trying to figure out how to use classes in MATLAB. I'm very familiar with C++ and Python but I just can't figure anything out about how to define classes in MATLAB. Does anyone know a very good resource with lots of examples? The official documentation leaves much to be desired.

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  • How do I write a bash script to restart a process if it dies?

    - by Tom
    I have a python script that'll be checking a queue and performing an action on each item: # checkqueue.py while True: check_queue() do_something() How do I write a bash script that will check if it's running, and if not, start it. Roughly the following pseudo code (or maybe it should do something like ps | grep?): # keepalivescript.sh if processidfile exists: if processid is running: exit, all ok run checkqueue.py write processid to processidfile I'll call that from a crontab: # crontab */5 * * * * /path/to/keepalivescript.sh Thanks in advance.

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  • Do really need a count lock on Multi threads with one CPU core?

    - by MrROY
    If i have some code looks like this(Please ignore the syntax, i want to understand it without a specified language): count = 0 def countDown(): count += 1 if __name__ == '__main__': thread1(countDown) thread2(countDown) thread3(countDown) Here i have a CPU with only one core, do i really need a lock to the variable count in case of it could be over-written by other threads. I don't know, but if the language cares a lot, please explain it under Java?C and Python, So many thanks.

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  • Get the currently played song in iTunes

    - by mariosangiorgio
    Hi, I'd like to get the name of the song that iTunes is currently playing. What API should I refer to? I'd like to use that both for a dashboard widget or a Java/python application depending on what it is easier to use. Do you have some references for me? Thanks in advance, Mario

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  • Generate T-SQL for Existing Indexes

    - by Chris S
    How do you programmatically generate T-SQL CREATE statements for existing indexes in a database? SQL Studio provides a "Script Index as-Create to" command that generates code in the form: IF NOT EXISTS(SELECT * FROM sys.indexes WHERE name = N'IX_myindex') CREATE NONCLUSTERED INDEX [IX_myindex] ON [dbo].[mytable] ( [my_id] ASC )WITH (SORT_IN_TEMPDB = OFF, DROP_EXISTING = OFF, IGNORE_DUP_KEY = OFF, ONLINE = OFF) ON [PRIMARY] GO How would you do this programmatically (ideally through Python)?

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  • Best way to write an image to a Django HttpResponse()

    - by k-g-f
    I need to serve images securely to validated users only (i.e. they can't be served as static files). I currently have the following Python view in my Django project, but it seems inefficient. Any ideas for a better way? def secureImage(request,imagePath): response = HttpResponse(mimetype="image/png") img = Image.open(imagePath) img.save(response,'png') return response (Image is imported from PIL.)

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  • Go - Raise an exception

    - by nevalu
    I would want to raise an exception as it's made in Python or Java --to finish the program with an error message--. An error message could be returned to a parent function: func readFile(filename string) (content string, err os.Error) { content, err := ioutil.ReadFile(filename) if err != nil { return "", os.ErrorString("read " + filename + ": " + err) } return string(content), nil } but I want that it can be finished when the error is found. Would be correct the next one? func readFile(filename string) (content string) { content, err := ioutil.ReadFile(filename) defer func() { if err != nil { panic(err) } }() return string(content) }

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  • replacing a path with sed

    - by compie
    How can I use sed to replace this line char * path_list_[1] = { "/some/random/path" }; with this line char * path_list_[2] = { "lib/foo", "lib/bar" }; in a file named source.c Notes: * The path is really random. * Your solution should only change this line in source.c * I'm only interested in a sed oneliner. You can use this Python regex as a starting point: text = re.sub('static const char \* path_list_\[1\] = \{ "[^"]*" \};', 'static const char * path_list_[2] = { "lib/sun", "lib/matlab" };', text)

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  • In django, how can I include some default records in my models.py?

    - by kdt
    If I have a models.py like class WidgetType(models.Model): name = models.CharField(max_length=200) class Widget(models.Model): typeid = models.ForeignKey(WidgetType) data = models.CharField(max_length=200) How can I build in a set of built in constant values for WidgetType when I know I'm only going to have a certain few types of widget? Clearly I could fire up my admin interface and add them by hand, but I'd like to simplify configuration by having it built into the python.

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  • How to sleep computer via batch file?

    - by Saebin
    So I want to make a batch file that will sleep my computer after a period of time. The closest thing I have found is placing it in standby, but seems to work differently then the sleep button on my keyboard (longer bootup, doesn't wake on mouse click). Any ideas? Would it be easier in python or c#?

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  • combobox in j2me

    - by learn
    how can i keep the combobox on the form in j2me with out using frameworks? i have tried this but it is not showing any drop down for selection. ChoiceGroup CoursePOP = new ChoiceGroup ("Pop Up choice", Choice.EXCLUSIVE, new String[] {"Python", "J2ME","Symbian"}, null);

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  • Exciting new Evented I/O technologies

    - by Saif Bechan
    Lately I have been having my eye on evented I/O to tackle some of my web application problems. I have been looking at things as Python's Twisted, Ruby's Eventmachine, and Node.js. Are there any other alternatives to these three, maybe in other languages as PHP ?

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  • Does Ruby have a special stack for returning a value?

    - by prosseek
    The following Ruby code def a(b,c) b+c end is the same as follows with Python def a(b,c): return b+c It looks like that ruby has the special stack that stores the final evaluation result and returns the value when a function is called. If so, what's the name of the stack, and how can I get that stack? If not, how does the Ruby code work without returning something?

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  • Postgres turn on log_statement programmatically

    - by rwallace
    I want to turn on logging of all SQL statements that modify the database. I could get that on my own machine by setting the log_statement flag in the configuration file, but it needs to be enabled on the user's machine. How do you enable it from program code? (I'm using Python with psycopg2 if it matters.)

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  • MVC alternatives: examples of MVA & AVC?

    - by Phillip Oldham
    I'm interested in learning about the alternative patterns to Model-View-Controller, specifically the Model-View-Adapter and Application-View-Controller patterns. Google results tend to be either a high-level overview or Java-based. Can anyone either provide, or point me to, an example of these patterns in either PHP, Python or JavaScript?

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  • Programming introduction book

    - by Avi
    Hello there, I've offered an out-of-job girl to help her study programming (with an MCSD as the ultimate goal) - and she has no progrmming knowledge. The idea is that she'll study from books and I"ll help. Help- I need a gentle introduction to programming book, very easy, very practical, very hands-on and up to date. Optimally would be for the .Net 4.0 MS enviornment (C#,Visual Basic) but other alternaitves (Jave, Python etc.) are OK.

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  • C Language Standard Collections Where Are They?

    - by flaxeater
    I have committed to learning C now, I'm good with Python/PHP/Bash but I've decided I'm limited by not being fluent in C. However I cannot imagine working in a language without lists and hashes, maybe I'm just jumping a gun, but surely there are 'standard' collection libraries. I do not see any in the GNU standard lib though, any suggestions?

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  • How can I implement incremental search on command line?

    - by florianbw
    I'd like to write small scripts which feature incremental search (find-as-you-type) on the command line. Use case: I have my mobile phone connected via USB, Using gammu --sendsms TEXT I can write text messages. I have the phonebook as CSV, and want to search-as-i-type on that. What's the easiest/best way to do it? It might be in bash/zsh/Perl/Python or any other scripting language.

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  • Is it possible to see the underlying implementation of built in functions of matlab?

    - by user198729
    I'm using this example code to grayscale an image,but the result is not right: I = imread('coins.png'); level = graythresh(I); BW = im2bw(I,level); imshow(BW) Where to see how graythresh is actually implemented? BTW,is there a reason for using matlab feels so alike with python? Or is it known that graythresh doesn't work well for images with little spatial resolution(like 62*21 ones)?

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