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  • geting the median of 3 values using sheme car & cdr

    - by kristian Roger
    Hi still stuck with the ugly scheme the problem this time is to get the median of three values (easy) I did all these : (define (med x y z) (car(cdr(x y z))) and it was accepted but when testing it (med 3 4 5) I will get this error Error: attempt to call a non-procedure (2 3 4) and when entering letters inetead of number i got (md x y z) Error: undefined varia y (package user) using somthin else than x y z i got (md d l m) Error: undefined variable d (package user) so what is wronge ?!

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  • Can you dynamically resize a java.util.concurrent.ThreadPoolExecutor while it still has tasks waitin

    - by Edward Shtern
    I'm working with a java.util.concurrent.ThreadPoolExecutor to process a number of items in parallel. Although the threading itself works fine, at times we've run into other resource constraints due to actions happening in the threads, which made us want to dial down the number of Threads in the pool. I'd like to know if there's a way to dial down the number of the threads while the threads area actually working. I know that you can call setMaximumPoolSize() and/or setCorePoolSize(), but these only resize the pool once threads become idle, but they don't become idle until there are no tasks waiting in the queue.

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  • Fastest primality test

    - by Grigory Javadyan
    Hi. Could you suggest a fast, deterministic method that is usable in practice, for testing if a large number is prime or not? Also, I would like to know how to use non-deterministic primality tests correctly. For example, if I'm using such a method, I can be sure that a number is not prime if the output is "no", but what about the other case, when the output is "probably"? Do I have to test for primality manually in this case? Thanks in advance.

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  • php mysql database users connection handling

    - by aviv
    What is the best way to handle mysql database users connection in PHP? I have a web server running a PHP application on MySQL. I have created a database user for the application: dbuser1 with limited access - only for query, insert and update tables. No alter table. Now the question is, should i use the same dbuser1 widely in my scripts, so if there are 100 current people using my system and hence 100 scripts running parallel they all connect to the database with the same dbuser1? or should i create a few users and assign each script a different user or load-balance between the dbusers ?

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  • can i do multiple things in one command on linux?

    - by Jason94
    Im testing something where im compiling some code and analysing output with a perl script. So first i run make, manually copy&paste the output to errors.txt and then running my perl script (running: perl analysis.pl) in terminal. Is there away I can do this just with one line in bash?

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  • File Formats Supported by UIWebView

    - by Mugunth Kumar
    What are all the file formats supported by UIWebView? In my testing, I found that it supports XLS, DOC, PPT, PDF but not XLSX, and DOCX, RTF. It supports image files like, JPG, PNG, GIF, BMP, not sure about TIFF or Exactly, what all types are supported is not clear... The UIWebView documentation also doesn't state it clearly. Could someone please help?

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  • Datamapper In Memory Database

    - by Daniel Ribeiro
    It is easy to setup Datamapper with a Sqlite3 in memory database with: DataMapper.setup :default, 'sqlite3::memory:'. However, when testing, I'd like to destroy the whole in memory database after each test, instead of invoking automigrate! as a shortcut on dropping everything. Is it possible? Or is it enough to set the default repository to nil, and let the garbage collector dispose of it?

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  • Can Perforce and SourceSafe co-exist in Visual Studio?

    - by Chris
    Visual Studio 2008, to be more specific. We're testing out moving to Perforce for source control, so I'd like to install the P4SCC plugin to monkey around with. However, I'd also like to continue using SourceSafe's IDE capabilities for projects that haven't been moved over yet. Can the two co-exist peacefully, or is it one or the other for a specific install of VS?

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  • Where to find free-to-use, complex test databases?

    - by Jay
    I need a database for testing a data masking solution. Any database would do (Oracle/MSSQL flavor). I just need the schema / db definition. I have tools to generate data records. The magnitude of database I am looking should have 30 odd tables with 30 odd columns in each table - a HUGE database. Do freely available complex database /schema definitions exist on the internet? If yes, where do I find them?

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  • HTML parser for GAE

    - by Richard
    Generally I use lxml for my HTML parsing needs, but that isn't available on Google App Engine. The obvious alternative is BeautifulSoup, but I find it chokes too easily on malformed HTML. Currently I am testing libxml2dom and have been getting better results. Which pure Python HTML parser have you found performs best? My priority is the ability to handle bad HTML over speed.

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  • What is the difference between NULL in C++ and null in Java?

    - by Stephano
    I've been trying to figure out why C++ is making me crazy typing NULL. Suddenly it hits me the other day; I've been typing null (lower case) in Java for years. Now suddenly I'm programming in C++ and that little chunk of muscle memory is making me crazy. Wikiperipatetic defines C++ NULL as part of the stddef: A macro that expands to a null pointer constant. It may be defined as ((void*)0), 0 or 0L depending on the compiler and the language. Sun's docs tells me this about Java's "null literal": The null type has one value, the null reference, represented by the literal null, which is formed from ASCII characters. A null literal is always of the null type. So this is all very nice. I know what a null pointer reference is, and thank you for the compiler notes. Now I'm a little fuzzy on the idea of a literal in Java so I read on... A literal is the source code representation of a fixed value; literals are represented directly in your code without requiring computation. There's also a special null literal that can be used as a value for any reference type. null may be assigned to any variable, except variables of primitive types. There's little you can do with a null value beyond testing for its presence. Therefore, null is often used in programs as a marker to indicate that some object is unavailable. Ok, so I think I get it now. In C++ NULL is a macro that, when compiled, defines the null pointer constant. In Java, null is a fixed value that any non-primitive can be assigned too; great for testing in a handy if statement. Java does not have pointers, so I can see why they kept null a simple value rather than anything fancy. But why did java decide to change the all caps NULL to null? Furthermore, am I missing anything here?

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  • Resource.h in Windows API simple app

    - by nXqd
    there'are these lines in the sample Win32 app created default by VS. Can you explain why they're just numbers, and it's meaning :) //{{NO_DEPENDENCIES}} // Microsoft Visual C++ generated include file. // Used by Testing Project.rc // #define IDS_APP_TITLE 103 #define IDR_MAINFRAME 128 #define IDD_TESTINGPROJECT_DIALOG 102 #define IDD_ABOUTBOX 103 #define IDM_ABOUT 104 #define IDM_EXIT 105 #define IDI_TESTINGPROJECT 107 #define IDI_SMALL 108 #define IDC_TESTINGPROJECT 109 #define IDC_MYICON 2 #ifndef IDC_STATIC #define IDC_STATIC -1 #endif // Next default values for new objects // #ifdef APSTUDIO_INVOKED #ifndef APSTUDIO_READONLY_SYMBOLS #define _APS_NO_MFC 130 #define _APS_NEXT_RESOURCE_VALUE 129 #define _APS_NEXT_COMMAND_VALUE 32771 #define _APS_NEXT_CONTROL_VALUE 1000 #define _APS_NEXT_SYMED_VALUE 110 #endif #endif

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  • JSON: How do I alert the name of the first node in level 1 in this code snippet?

    - by user143805
    var response = "{\"tree\":[{\"level1\":[{\"node\":{\"id\": 1,\"name\": \"paradox\",\"parent\": 0}}]},{\"level2\":[{\"node\":{\"id\": 2,\"name\": \"lucent\",\"parent\": 1}},{\"node\":{\"id\": 3,\"name\": \"reiso\",\"parent\": 1}}]},{\"level3\":[{\"node\":{\"id\": 4,\"name\": \"pessi\",\"parent\": 3}},{\"node\":{\"id\": 5,\"name\": \"misho\",\"parent\": 2}}]},{\"level4\":[{\"node\":{\"id\": 6,\"name\": \"hema\",\"parent\": 5}},{\"node\":{\"id\": 7,\"name\": \"iiyo\",\"parent\": 4}}]}]}"; var data = eval("(" + response + ")"); This is a dummy json response I am currently testing. Now how do I get the value of "name" in the 1st node of "level1" from the "tree"? Thanks

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  • linux tooling for starting as a net programmer

    - by alfredo dobrekk
    What are the linux developper tools to do the things i do with .NET in my windows environnement : I would like to port my client server application that runs under winform/nhibernate/sql server. Language c# Database SQL server ORM Nhibernate Source control SVN / Tortoise Unit testing Nunit Continuous integration Cruise Control Should i go java and eclipse ? Python and ??? Ruby and ??? Is there some IDE that allow me to manage all these processes under linux ?

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  • Getting started on a stream interface driver

    - by Ranhiru
    I want to build a stream interface driver for testing purposes but I am completely lost. I don't know which IDE to use VS2008 or Platform Builder. Platform Builder is whopping 20GB to download :( Can anyone guide me on how i create the .dll file and include XXX_Open, XXX_Close, XXX_Write, XXX_Read in the dll file? Should i write the .dll file in C++ or can i write it in C#? Please guide me through the basics :) Thanx a lot :)

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  • ESS workflow for R project/package development

    - by ahala
    Can anyone share his experience on workflow for R peject development under ESS? I tried several times to learn emacs but I have not get it yet. I can understand ESS as an editor, but is there a project view in ESS? what's the efficient ways to set up/view R project directory, coding, and testing? Thanks for any advices.

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  • Grails - Link checking as part of a continuous integration.

    - by Reverend Gonzo
    So, we have a grails app set up with a Hudson CI build process. We're running unit tests, integration tests, and about to set up Selenium for some functional tests as well. However, are there any good ways of fully testing a sites links to make sure nothing has broken in a release. I know there's link checkers in general, but I'd like to have it be a part of the build process, so a build outright fails if something isn't right.

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  • Performance optimization for SQL Server: decrease stored procedures execution time or unload the ser

    - by tim
    We have a web service which provides search over hotels. There is a problem with performance: a single request to the service takes around 5000 ms. Almost all of the time is spent in database by executing storing procedures. During the request our server (mssql2008) consumes ~90% of the processor time. When 2 requests are made in parallel the average time grows and is around 7000 ms. When number of request is increasing, the average time of response is increasing as well. We have 20-30 requests per minute. Which kind of optimization is the best in this case having in mind that the goal is to provide stable response time for the service: 1) Try to decrease the stored procedures execution time 2) Try to find the way how to unload the server It is interesting to hear from people who deal with booking sites.

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  • Given two lines on a plane, how to find integer points closest to their intersection?

    - by Lukasz Lew
    I can't solve it: You are given 8 integers: A, B, C representing a line on a plane with equation A*x + B*y = C a, b, c representing another line x, y representing a point on a plane The two lines are not parallel therefore divide plane into 4 pieces. Point (x, y) lies inside of one these pieces. Problem: Write a fast algorithm that will find a point with integer coordinates in the same piece as (x,y) that is closest to the cross point of the two given lines. Note: This is not a homework, this is old Euler-type task that I have absolutely no idea how to approach. Update: You can assume that the 8 numbers on input are 32-bit signed integers. But you cannot assume that the solution will be 32 bit.

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  • Unit test distributed software

    - by user262646
    Is there any tool or framework able to make it easier to "unit test" distributed software written in Java? My system under test is a peer-to-peer software, and I'd like to perform testing using something like PNUnit, but with Java instead of .Net.

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  • Avoid copying of data between user and kernel space and vice-versa

    - by bala1486
    Hello, I am developing a active messaging protocol for parallel computation that replaces TCP/IP. My goal is to decrease the latency of a packet. Since the environment is a LAN, i can replace TCP/IP with simpler protocol to reduce the packet latency. I am not writing any device driver and i am just trying to replace the TCP/IP stack with something simpler. Now I wanted to avoid copying of a packet's data from user space to kernel space and vice-versa. I heard of the mmap(). Is it the best way to do this? If yes, it will be nice if you can give links to some examples. I am a linux newbie and i really appreciate your help.. Thank you... Thanks, Bala

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