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  • Fastest Way to generate 1,000,000+ random numbers in python

    - by Sandro
    I am currently writing an app in python that needs to generate large amount of random numbers, FAST. Currently I have a scheme going that uses numpy to generate all of the numbers in a giant batch (about ~500,000 at a time). While this seems to be faster than python's implementation. I still need it to go faster. Any ideas? I'm open to writing it in C and embedding it in the program or doing w/e it takes. Constraints on the random numbers: A Set of numbers 7 numbers that can all have different bounds: eg: [0-X1, 0-X2, 0-X3, 0-X4, 0-X5, 0-X6, 0-X7] Currently I am generating a list of 7 numbers with random values from [0-1) then multiplying by [X1..X7] A Set of 13 numbers that all add up to 1 Currently just generating 13 numbers then dividing by their sum Any ideas? Would pre calculating these numbers and storing them in a file make this faster? Thanks!

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  • Code Golf: Ghost Leg

    - by Anax
    The challenge The shortest code by character count that will output the numeric solution, given a number and a valid string pattern, using the Ghost Leg method. Examples Input: 3, "| | | | | | | | |-| |=| | | | | |-| | |-| |=| | | |-| |-| | |-|" Output: 2 Input: 2, "| | |=| | |-| |-| | | |-| | |" Output: 1 Clarifications Do not bother with input. Consider the values as given somewhere else. Both input values are valid: the column number corresponds to an existing column and the pattern only contains the symbols |, -, = (and [space], [LF]). Also, two adjacent columns cannot both contain dashes (in the same line). The dimensions of the pattern are unknown (min 1x1). Clarifications #2 There are two invalid patterns: |-|-| and |=|=| which create ambiguity. The given input string will never contain those. The input variables are the same for all; a numeric value and a string representing the pattern. Entrants must produce a function. Test case Given pattern: "|-| |=|-|=|LF| |-| | |-|LF|=| |-| | |LF| | |-|=|-|" |-| |=|-|=| | |-| | |-| |=| |-| | | | | |-|=|-| Given value : Expected result 1 : 6 2 : 1 3 : 3 4 : 6 5 : 5 6 : 2

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  • Executing functions parallelly in PHP

    - by binaryLV
    Hi! Can PHP call a function and don't wait for it to return? So something like this: function callback($pause, $arg) { sleep($pause); echo $arg, "\n"; } header('Content-Type: text/plain'); fast_call_user_func_array('callback', array(3, 'three')); fast_call_user_func_array('callback', array(2, 'two')); fast_call_user_func_array('callback', array(1, 'one')); would output one (after 1 second) two (after 2 seconds) three (after 3 seconds) rather than three (after 3 seconds) two (after 3 + 2 = 5 seconds) one (after 3 + 2 + 1 = 6 seconds) Main script is intended to be run as a permanent process (TCP server). callback() function would receive data from client, execute external PHP script and then do something based on other arguments that are passed to callback(). The problem is that main script must not wait for external PHP script to finish. Result of external script is important, so exec('php -f file.php &') is not an option.

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  • Lambda recursive PHP functions.

    - by Kendall Hopkins
    Is it possible to have a PHP function that is both recursive and anonymous (lambda). This is my attempt to get it to work, but it doesn't pass in the function name. $factorial = function( $n ) use ( $factorial ) { if( $n == 1 ) return 1; return $factorial( $n - 1 ) * $n; }; print $factorial( 5 ); I'm also aware that this is a bad way to implement factorial, it's just an example.

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  • Javascript Anonymous Functions and Global Variables

    - by Jonathan Swift
    I thought I would try and be clever and create a Wait function of my own (I realise there are other ways to do this). So I wrote: var interval_id; var countdowntimer = 0; function Wait(wait_interval) { countdowntimer = wait_interval; interval_id = setInterval(function() { --countdowntimer <=0 ? clearInterval(interval_id) : null; }, 1000); do {} while (countdowntimer >= 0); } // Wait a bit: 5 secs Wait(5); This all works, except for the infinite looping. Upon inspection, if I take the While loop out, the anonymous function is entered 5 times, as expected. So clearly the global variable countdowntimer is decremented. However, if I check the value of countdowntimer, in the While loop, it never goes down. This is despite the fact that the anonymous function is being called whilst in the While loop! Clearly, somehow, there are two values of countdowntimer floating around, but why?

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  • Excel Functions

    - by dwyane
    =MAX(SUM(A1:A5)) How do i incorporate the above formula into =IF( AND( $H$14<F22, F22<=($H$14+$H$15) ), $I$15, IF( AND( $H$14+$H$15<F22, F22<($H$14+$H$15+$H$16) ), $I$16, IF( AND( $H$14+$H$15+$H$16<F22, F22<=($H$14+$H$15+$H$16+$H$17) ), $I$17, $I$14 ) ) ) It keeps running a circular reference error. Help! The sum value shouldnt exceed 150. If exceed, then replace the cell with zero value.

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  • In Python, are there builtin functions for elementwise map of boolean operators over tuples of lists

    - by bshanks
    For example, if you have n lists of bools of the same length, then elementwise boolean AND should return another list of that length that has True in those positions where all the input lists have True, and False everywhere else. It's pretty easy to write, i just would prefer to use a builtin if one exists (for the sake of standardization/readability). Here's an implementation of elementwise AND: def eAnd(*args): return [all(tuple) for tuple in zip(*args)] example usage: >>> eAnd([True, False, True, False, True], [True, True, False, False, True], [True, True, False, False, True]) [True, False, False, False, True] thx

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  • Python modules, classs, functions documentation through Sphinx

    - by user343934
    Hi everyone, I am trying to document my small project through sphinx which im recently trying to get familiar with. I read some tutorials and sphinx documentation but couldn't make it. Setup and configurations are ok! just have problems in using sphinx in a technical way. My table of content should look like this --- Overview .....Contents ----Configuration ....Contents ---- System Requirements .....Contents ---- How to use .....Contents ---- Modules ..... Index ......Display ----Help ......Content Moreover my focus is on Modules with docstrings. Details of Modules are Directory:- c:/wamp/www/project/ ----- Index.py >> Class HtmlTemplate: .... def header(): .... def body(): .... def form(): .... def header(): .... __init_main: ----- display.py >> Class MainDisplay: .... def execute(): .... def display(): .... def tree(): .... __init_main: My Documentation Directory:- c:/users/abc/Desktop/Documentation/doc/ --- _build --- _static --- _templates --- conf.py --- index.rst I have added Modules directory to the system environment and edited index.rst with following codes Welcome to Seq-alignment's documentation! Contents: .. toctree:: :maxdepth: 2 .. automodule:: index.py .. autoclass:: HtmlTemplate :members:Header,Body,Form,Footer,CloseHtml .. automodule:: display.py .. autoclass:: MainDisplay :members:execute,display,tree Indices and tables :ref:genindex :ref:modindex :ref:search When i make html file and view it, apparently i dont get Modules in the content tables but just there is show record and when i click it just i get "index.txt" version in another window. I need your suggestions Thanks

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  • Calling different functions depending on the template parameter c++

    - by Noman Javed
    I want to have something like that class A { public: Array& operator()() { . . . } }; class B { public: Element& operator[](int i) { ... } }; template<class T> class execute { public: output_type = operator()(T& t) { if(T == A) Array out = T()(); else { Array res; for(int i=0 ; i < length; ++i) a[i] = t[i]; } } }; There are two issues here 1. Meta-function replacing if-else in the execute operator() 2. Return type of execute operator() Thanks in anticipation Noman

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  • Tying in .addClass() with other functions?

    - by Anders H
    Assuming an accordion dropdown with the standard form of: <ul> <li> <a href="#">Main Element</a> <ul> <li> <a href="#">Dropdown Element</a> </li> </ul> </li> </ul> I'm using jQuery to expand when the parent element link is clicked: var $j = jQuery.noConflict(); function initMenus() { $j('ul.menu ul').hide(); $j.each($j('ul.menu'), function(){ $j('#' + this.id + '.expandfirst ul:first').show(); }); $j('ul.menu li a').click( function() { var checkElement = $j(this).next(); var parent = this.parentNode.parentNode.id; if($j('#' + parent).hasClass('noaccordion')) { $j(this).next().slideToggle('normal'); return false; } if((checkElement.is('ul')) && (checkElement.is(':visible'))) { if($j('#' + parent).hasClass('collapsible')) { $j('#' + parent + ' ul:visible').slideUp('normal'); } return false; } if((checkElement.is('ul')) && (!checkElement.is(':visible'))) { $j('#' + parent + ' ul:visible').slideUp('normal'); checkElement.slideDown('normal'); return false; } } ); } $j(document).ready(function() {initMenus();}); To add a class to the Main Element when clicked (aka the class is enabled anytime the dropdown is expanded) I'm trying to use .toggleClass(className) without luck, most likely to my positioning. Where can I add this element to get the desired effect?

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  • Looking for a clear and concise web page explaining why lower bits of random numbers are usually not

    - by Hamish Grubijan
    I am putting together an internal "every developer should know" wiki page. I saw many discussions regarding rand() % N, but not a single web page that explains it all. For instance, I am curious if this problem is only C- and Linux-specific, or if it also applies to Windows, C++,. Java, .Net, Python, Perl. Please help me get to the bottom of this. Also, just how non-random do the numbers get? Thank you!

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  • Using system time directly to get random numbers

    - by Richard Mar.
    I had to return a random element from an array so I came up with this placeholder: return codes[(int) (System.currentTimeMillis() % codes.length - 1)]; Now than I think of it, I'm tempted to use it in real code. The Random() seeder uses system time as seed in most languages anyway, so why not use that time directly? As a bonus, I'm free from the worry of non-random lower bits of many RNGs. It this hack coming back to bite me? (The language is Java if that's relevant.)

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  • Where to store frequently used functions in a OOP correct way

    - by Stefan Kuijers
    I'm working on a project which I want to build up OO. Now I came with a function that checks or a value is valid. private function valid(value:*, acceptedValues:Array):Boolean { for(var i:uint = 0; i < acceptedValues.length; i++) { if (value == acceptedValues[i]) { return true; } } return false; } As you can see, the function is very general and will be accessed across different classes. Now my question is; where do I store it in a OO correct way? Thanks in advance!

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  • Aggregate Functions in Index with IBMDB2

    - by Erkan
    Is there any way to pre aggregate results of aggregate functionts (f.i. count()) and store it in an index? The background is: i want to speed up count() queries. So that: Select count(users) from TE123 where region = 'A'; would be supported by an index like Region Count(Users) A 548 E 458 I know that MQTs would also help for this problem. However, in this case it is not possible to use MQT, as we use kind of an ORM and we don't want to define Entities on MQTs. I just slightly remember - one DBA told me - that there is such a function planned for DB2 V10.

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  • C++: calling member functions within constructor?

    - by powerboy
    The following code raises a runtime error: #include <iostream> #include <iterator> #include <ext/slist> class IntList : public __gnu_cxx::slist<int> { public: typedef IntList::iterator iterator; IntList() { tail_ = begin(); } // seems that there is a problem here void append(const int node) { tail_ = insert_after(tail_, node); } private: iterator tail_; }; int main() { IntList list; list.append(1); list.append(2); list.append(3); for (IntList::iterator i = list.begin(); i != list.end(); ++i) { std::cout << *i << " "; } return 0; } Seems that the problem is in the constructor IntList(). Is it because it calls the member function begin()?

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  • JavaScript functions broke my page jumps?

    - by Mark
    Hi everybody, I'm trying to develop a personal website and running into some issues. At the top of my page I had a horizontal table that contained 6 different images (buttons) that linked to different sections of the page. I wanted to spice up the buttons with JavaScript and make the image of the button change onMouseOver and onMouseOut so I found a way to do so online with some JavaScript but the problem now is that the buttons no longer jump to the appropriate section of the page when using Google Chrome or Safari, but in IE 9 they still do work correctly... Here is my old code that worked properly: <html> ... <body> <center> <table border="1" style="color:#D80000;text-align:center"> <tr> <td> <a href="#about"><img src="images/aboutMe.png" alt="About Me"></a> </td> <td> <a href="#courses"><img src="images/courseList.png" alt="Courses"></a> </td> <td> <a href="#work"><img src="images/workHistory.png" alt="Work History"></a> </td> <td> <a href="#places"><img src="images/placesBeen.png" alt="Places I've Been"></a> </td> <td> <a href="#games"><img src="images/gamesPlay.png" alt="Games I Play"></a> </td> <td> <a href="#contact"><img src="images/contactMe.png" alt="Contact"></a> </td> </tr> </table> </center> ... </body> </html> Here is my new code that is now broken: <html> <head> ... <script type="text/javascript"> <!-- if (document.images) { <!-- Preload original Images --> var about_init= new Image(); about_init.src="images/aboutMe.png"; var courses_init= new Image(); courses_init.src="images/courseList.png"; var work_init= new Image(); work_init.src="images/workHistory.png"; var places_init= new Image(); places_init.src="images/placesBeen.png"; var games_init= new Image(); games_init.src="images/gamesPlay.png"; var contact_init= new Image(); contact_init.src="images/contactMe.png"; <!--Preload images for mouseover --> var about_new= new Image(); about_new.src="images/aboutAlt.png"; var courses_new= new Image(); courses_new.src="images/courseAlt.png"; var work_new= new Image(); work_new.src="images/workAlt.png"; var places_new= new Image(); places_new.src="images/placesAlt.png"; var games_new= new Image(); games_new.src="images/gamesAlt.png"; var contact_new= new Image(); contact_new.src="images/contactAlt.png"; } function change_it(the_name) { if (document.images) { document.images[the_name].src= eval(the_name+"_new.src"); } } function change_back(the_name) { if (document.images) { document.images[the_name].src= eval(the_name+"_init.src"); } } //--> </script> </head> <body> ... <center> <table border="1" style="color:#D80000;text-align:center"> <tr> <td> <a href="#about" onMouseOver="change_it('about')" onMouseOut="change_back('about')"><img src="images/aboutMe.png" name="about" id="about" border="0" alt="About Me"></a> </td> <td> <a href="#courses" onMouseOver="change_it('courses')" onMouseOut="change_back('courses')"><img src="images/courseList.png" name="courses" id="courses" border="0" alt="Courses"></a> </td> <td> <a href="#work" onMouseOver="change_it('work')" onMouseOut="change_back('work')"><img src="images/workHistory.png" name="work" id="work" border="0" alt="Work History"></a> </td> <td> <a href="#places" onMouseOver="change_it('places')" onMouseOut="change_back('places')"><img src="images/placesBeen.png" name="places" id="places" border="0" alt="Places I've Been"></a> </td> <td> <a href="#games" onMouseOver="change_it('games')" onMouseOut="change_back('games')"><img src="images/gamesPlay.png" name="games" id="games" border="0" alt="Games I Play"></a> </td> <td> <a href="#contact" onMouseOver="change_it('contact')" onMouseOut="change_back('contact')"><img src="images/contactMe.png" name="contact" id="contact" border="0" alt="Contact"></a> </td> </tr> </table> </center> ... </body> </html> The images properly switch when the mouse is moved over/off them, but the jump to the corresponding page sections seems to be broken, it seems like they're all jumping to the #about section now. Once again, the weirder thing is that this is only the case when I'm using Google Chrome on my laptop running Windows 7 or Safari using my iPhone 4 but when I use the new Internet Explorer 9 on my laptop running Windows 7 all the buttons still link correctly. Any idea what's breaking the links?

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  • Why can't c# calculate exact values of mathematical functions

    - by Timo Willemsen
    Hey everyone, Why can't c# do any exact operations. Math.Pow(Math.Sqrt(2.0),2) == 2.0000000000000004 I know how doubles work, I know where the rounding error is from, I know that it's almost the correct value, and I know that you can't store infinite numbers in a finite double. But why isn't there a way that c# can calculate it exactly, while my calculator can do it. Edit It's not about my calculator, I was just giving an example: http://www.wolframalpha.com/input/?i=Sqrt%282.000000000000000000000000000000000000000000000000000000000000000000000000000000001%29%5E2 Cheers

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  • Row/column counter in 'apply' functions

    - by mortalitysequence
    What if one wants to apply a functon i.e. to each row of a matrix, but also wants to use as an argument for this function the number of that row. As an example, suppose you wanted to get the n-th root of the numbers in each row of a matrix, where n is the row number. Is there another way (using apply only) than column-binding the row numbers to the initial matrix, like this? test <- data.frame(x=c(26,21,20),y=c(34,29,28)) t(apply(cbind(as.numeric(rownames(test)),test),1,function(x) x[2:3]^(1/x[1]))) P.S. Actually if test was really a matrix : test <- matrix(c(26,21,20,34,29,28),nrow=3) , rownames(test) doesn't help :( Thank you.

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  • Scala return type for tuple-functions

    - by Felix
    Hello Guys, I want to make a scala function which returns a scala tuple. I can do a function like this: def foo = (1,"hello","world") and this will work fine, but now I want to tell the compiler what I expect to be returned from the function instead of using the built in type inference (after all, I have no idea what a (1,"hello","world") is) I thought I remembered the classname being something like Tuple3[Int,String,String] but that doesnt work for me. Suggestions? :D (ps: I love stack overflow!)

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  • c# template member functions

    - by user3730583
    How can I define a template member function in C# For instance I will fill any collection which supports an Add(...) member function, please check out the sample code below public class CInternalCollection { public static void ExternalCollectionTryOne<T<int>>(ref T<int> ext_col, int para_selection = 0) { foreach (int int_value in m_int_col) { if (int_value > para_selection) ext_col.Add(int_value); } } public static void ExternalCollectionTryTwo<T>(ref T ext_col, int para_selection = 0) { foreach (int int_value in m_int_col) { if (int_value > para_selection) ext_col.Add(int_value); } } static int[] m_int_col = { 0, -1, -3, 5, 7, -8 }; } The ExternalCollectionTryOne<...(...) would be the preferred kind, because the int type can be explicit defined, but results in an error: Type parameter declaration must be an identifier not a type The type or namespace name 'T' could not be found (are you missing a using directive or an assembly reference?) The ExternalCollectionTryTwo<...(...) results in an error: 'T' does not contain a definition for 'Add' and no extension method 'Add' accepting a first argument of type 'T' could be found (are you missing a using directive or an assembly reference?)... I hope the problem is clear – any suggestions? ----------------------------- edit -------------------------- The answers with the interface ICollection<.. without a template member works fine and thanks all for this hint, but I still cannot define successfully a member template(generic) function So a more simpler example ... how can I define this public class CAddCollectionValues { public static void AddInt<T>(ref T number, int selection) { T new_T = new T(); //this line is just an easy demonstration to get a compile error with type T foreach (int i_value in m_int_col) { if (i_value > selection) number += i_value; //again the type T cannot be used } } static int[] m_int_col = { 0, -1, -3, 5, 7, -8 }; }

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  • Asterisk with new functions

    - by MhdAboAhmad
    hi all , please need help for an asterisk I created a write func odbc list records files in sql table: [R] dsn=connector write=INSERT INTO ast_records (filename,caller,callee,dtime) VALUES ('${ARG1}','${ARG2}','${ARG3}','${ARG4}') prefix=M and set it in dialplan : exten = _0X.,n,Set( M_R(${MIXMONITOR_FILENAME}\,${CUSER}\,${EXTEN}\,${DTIME})= ) when I excute it I get an error : ast_func_write: M_R Function not registered:

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  • C++ code parser/processor library

    - by uray
    is there any library that parse a source code of C++ to produce lets say, call graph, class inheritance tree, flow control, class member list or anything as a ready to use graph or structure in code (not in diagram image). to make it more clear, suppose to generate call graph image, there will be a process like this: ` C++ source -> parser -> intermediate structure -> renderer -> call graph image ^ | [i need this] `

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