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• How can I find the boundaries of a subset of a sorted list?

  - by Alex

  I have the following dilemma: I have a list of strings, and I want to find the set of string which start with a certain prefix. The list is sorted, so the naive solution is this: Perform binary search on the prefixes of the set, and when you find an element that starts with the prefix, traverse up linearly until you hit the top of the subset. This runs in linear time, however, and I was wondering if anyone can suggest a more efficient way to do it.

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• What is the difference between printf() and puts() in C?

  - by alex

  First up, I should let you know that I am learning C, so my apologies if this question seems stupid to a more advanced developer. I know you can print with printf() and puts(). I can also see that printf() allows you to embed variables inside and do some stuff like formatting. Is puts() merely a primitive version of printf(). Should it be used for every possible printf() without string interpolation? Thanks

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• I want to extend std::string, but not for the reason you might think.

  - by Alex

  I have a method that effectively takes a string. However, there is a very limited subset of strings I want to use. I was thinking of typedef'ing std::string as some class, and call the functions explicit. I'm not sure that would work, however. Ideas?

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• Translate sequence in macro parameters to separate macros

  - by Alex Tiger

  How to acces each element in macro if the definition is like MACRO(name, seq) and the code is like: MACRO("TheName", (Elem1) (Elem2) (Elem3) ) I want to generate the next code: MACRO("TheName", ELEMMACRO(Elem1) ELEMMACRO(Elem2) ELEMMACRO(Elem3) ) Or something like that. In other words, I want to process every parameter separately (I don't care of definition, even if it will be something like MACRO("TheName", Elem1, Elem2, Elem3 ) There could be more elements, there could be less. I have tried V_ARGS (I need it only for gcc), but I can only copy all the elements by that, not to process them separately. What can I do? P.S. Because of some reasons, I can't use Boost.

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• What is most efficient way of setting row to zeros for a sparce scipy matrix?

  - by Alex Reinking

  I'm trying to convert the following MATLAB code to Python and am having trouble finding a solution that works in any reasonable amount of time. M = diag(sum(a)) - a; where = vertcat(in, out); M(where,:) = 0; M(where,where) = 1; Here, a is a sparse matrix and where is a vector (as are in/out). The solution I have using Python is: M = scipy.sparse.diags([degs], [0]) - A where = numpy.hstack((inVs, outVs)).astype(int) M = scipy.sparse.lil_matrix(M) M[where, :] = 0 # This is the slowest line M[where, where] = 1 M = scipy.sparse.csc_matrix(M) But since A is 334863x334863, this takes like three minutes. If anyone has any suggestions on how to make this faster, please contribute them! For comparison, MATLAB does this same step imperceptibly fast. Thanks!

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• Is it possible to detect the browser version from Django server side?

  - by alex

  in server side, not browser.

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• How do I replace everything with one? (in a string) In Pythong

  - by alex

  Suppose I have this: My---sun--is------very-big---. I want to replace all multiple hyphens with just one hyphen.

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• How Similar are Java, C#, and Python?

  - by Alex

  I know it is a kind of broad question but any answer are appreciated.

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• Java / MySQL - How to access connection from another class?

  - by Alex

  I'm just getting my head around java (and OOP for that matter), the only thing I am familiar with is MySQL. I need to keep the DB connection open throughout the duration of the application, as well as a server socket. I'm not even sure if they both need separate classes, but here's what I have so far: http://pastebin.com/qzMFFTrY (it wouldn't all go in a code tag) The variable I need is con for line 86.

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• How do I send this email in Python, opening files and stuff?

  - by alex

  msg = EmailMessage(subject, body, from_email, [to_email]) msg.content_subtype = "html" msg.send() This is how I send an email in Django. But what if I want to open a text file and take into account all its line breaks and tabs. I want to take the body of the text file (with line breaks \n) and email it as text of the "body".

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• How to enable SQL output to log file with Zend_Db?

  - by Alex N.

  I wonder if this possible with Zend_Db, but I am looking for something like SQL query logging similar to how Hibernate does it, where it shows you what SQL it generates in the log file.

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• jquery $.ajax load in UI dialog() problem

  - by alex

  i have a working bing Image search api with jsonp datatype. It's working with no problems. When i load the image search script in a Jquery UI dialog, it display properly and i'm able to search and see the results in the dialog() box. But if i close the dialog() and open it again, now if i search no results show. Looking at console.log, i do confirm the jason data is recieved, but for some reason it's not appending to the result div, so i see no result on the screen. This onyl happens if i close the dialog and open it again. If i refresh refresh the page and open the dialog again then search results are displayed. This is what i'm using to append the results. $.each(data.SearchResponse.Image.Results, function(i, item) { console.log(item.Thumbnail.Url); $("#Results").append("<li><img style='width:100px; height:75px;' src='" + item.Thumbnail.Url + "'/></li>"); });

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• Double "!!" in Ruby [closed]

  - by Alex Maslakov

  Possible Duplicate: What does !! mean in ruby? Ruby, !! operator (a/k/a the double-bang) Sometimes I see a Ruby code like this def sent? !!@sent_at end It seems to be not logical. Is it necessary to use here double !? As far as I'm concerned, it might be just def sent? @sent_at end UPDATE: then what is the difference between these def sent? !!@sent_at end def sent? @sent_at.nil? end def sent? @sent_at == nil end

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• What is (self) in the python code? (OOP question)

  - by alex

  class MyController(BaseController): def index(self): # Return a rendered template #return render('/test.mako') # or, return a response return '' Why does the function "index" have "self"? I got this code from Pylons controller

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• What web framework uses "javascript:__doPostBack()"

  - by alex

  I've seen this all over the web javascript:__doPostBack('ctl00$ContentPlaceHolder1$lnk2','') Checking headers of the last place I saw it didn't reveal a server side language. What server side language and/or framework encourages this style of link?

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• DELETE and ACCESS

  - by Alex

  Where is the error in this statement? query = "DELETE TOP 10 FROM table WHERE field LIKE \"something*\"" I get an error on the query sytax. Thanks.

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• How do I merge dictionaries together in Python?

  - by alex

  d3 = dict(d1, **d2) I understand that this merges the dictionary. But, is it unique? What if d1 has the same key as d2 but different value? I would like d1 and d2 to be merged, but d1 has priority if there is duplicate key.

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• SElinux integrety check

  - by Alex

  How can i check (with SELinux) access to the file by process name? For examle: we have 2 process: * /usr/bin/foo1 * /usr/bin/foo2 They are run under account with username userA and try to open for modify file: /home/userA/test.txt I want that if foo1 try to open file - it's ok. But if foo2 try to open this file - i have message about this in /var/log Problem is that both processes have the same user ID. And i cant use RBAC by username.

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• Get page url using javascript

  - by Alex

  Hello, could some one recommend a way to get page name from a url using JavaScript? For instance if I have http://www.cnn.com/news/1234/news.html?a=1&b=2&c=3 I just need to get "news.html" string Thanks!

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• What tool do you use to export/import groups and user IDs on Windows servers?

  - by Alex

  Hi. What's a free tool to export the groups and users on a Windows server and then import them again on a rebuilt system? Thanks.

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• In Django/python, how do I set the memcache to infinite time?

  - by alex

  cache.set(key, value, 9999999) But this is not infinite time...

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• Remove a character from a given position on Oracle

  - by alex

  Is there anyway to remove a character from a given position? Let's say my word is: PANCAKES And I want to remove the 2nd letter (in this case, 'A'), so i want PNCAKES as my return. Translate doesnt work for this. Replace doesnt work for this. Regex is damn complicated... Ideas?

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• Help with manipulating some strings.

  - by Alex

  My strings are of this kind: City (PR) from a Database, where PR stands for Province. At the end I want two separate variables. City and PR. I have to do this with C#. Any idea? Thanks.

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• What charectar range would this represent (regular expression)?

  - by Alex

  Recently I came across a character range that was the following: [/-+] My very simple question is, is this even a valid charectar range? If so, what range of charectars would it match?

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• Ubuntu 10.10, taskbar

  - by Alex

  I launched system monitor to kill one program, which didn't responded on any mouse clicks, etc. But i occasionally killed another process. so, taskbar was killed. (it was in the bottom of the screen, in the top all is good) reboot didnt help o_O. Now I use Alt-Tab and alt-controll-arrows to switch between programs and desktops (it works). How to launch taskbar again? its very strange that reboot didnt help me.

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