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  • When should I use $ (and can it always be replaced with parentheses)?

    - by J Cooper
    From what I'm reading, $ is described as "applies a function to its arguments." However, it doesn't seem to work quite like (apply ...) in Lisp, because it's a binary operator, so really the only thing it looks like it does is help to avoid parentheses sometimes, like foo $ bar quux instead of foo (bar quux). Am I understanding it right? Is the latter form considered "bad style"?

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  • Learning the Introspection API (used by FxCop)

    - by Anand Patel
    Microsoft's FxCop tool uses the introspection API. This introspection API could be used to develop new code analysis tools. But the introspection api is not documented well. Additionally, I was not able to figure out any blogs which explains this API in breadth and depth of it. The knowledge gained by understanding the API can also be used for writing custom FxCop rules. Does anybody knows about any blog or resources which explains the same?

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  • Ruby on Rails: Accessing production database data for testing

    - by williamjones
    With Ruby on Rails, is there a way for me to dump my production database into a form that the test part of Rails can access? I'm thinking either a way to turn the production database into fixtures, or else a way to migrate data from the production database into the test database that will not get routinely cleared out by Rails. I'd like to use this data for a variety of tests, but foremost in my mind is using real data with the performance tests, so that I can get a realistic understanding of load times.

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  • Very basic question about Hadoop and compressed input files

    - by Luis Sisamon
    I have started to look into Hadoop. If my understanding is right i could process a very big file and it would get split over different nodes, however if the file is compressed then the file could not be split and wold need to be processed by a single node (effectively destroying the advantage of running a mapreduce ver a cluster of parallel machines). My question is, assuming the above is correct, is it possible to split a large file manually in fixed-size chunks, or daily chunks, compress them and then pass a list of compressed input files to perform a mapreduce?

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  • Own CMS or Blog

    - by Xander cage
    I'm trying t build a somekind a clone to wordpress and have some problems understanding the functions that are used there. But that's not the problem.. The thing I'm looking for is good book that detailed explains what aspects to be aware of during the creation of the cms and some code snippets or something in that direction.. With best regards

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  • XML security in world wide web

    - by nikky
    Hi, Im a newbie in XML and i have some questions Can XML be used in stead of normal database (store data in a tuple and column) in website? XML is built to share information easier (from my understanding) such as can share cross platform and in different language used so Is it secure to store secure data in XML? thank you so much

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  • How does PHP work - literature

    - by Ondrej Slinták
    I'm interested in literature (articles on internet, in magazines, books, podcasts - I don't really mind anything) that describes how PHP works internally, about its gotchas and perhaps some advanced functions. Is there anything like this out there? I tried to search on Google, but majority of articles were about starting with PHP and its basic functions. Any input is really welcome as I'm trying to understand the language internally - I'm tired of my mindless typing of code without understanding its essence.

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  • Java - JPA - @Basic and @Embedded

    - by Yatendra Goel
    I am learning JPA from this tutorial. I have some confusions in understanding the following annotations: @Basic @Embedded Fields of an embeddable type default to persistent, as if annotated with @Embedded. If the fields of embeddable types defualt to persistent, then why would we need @Embedded

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  • Using Ruby/Python code in an iPhone OS app?

    - by igul222
    My app needs to use a library which is only available for Python and Ruby. From my understanding, Apple allows Ruby to run on iPhone as long as users can't execute arbitrary code (Rhomobile uses Ruby). How can I bundle Ruby/Python with my app, call a function from my Obj-C code, and get the result (a string) back in C or Obj-C format?

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  • What is call out table in unix?

    - by Supereme
    Hi, Can anybody tell me the 'call out table' in unix? The explanation is given in 'Maurice J. Bach' book but I'm getting difficulty in understanding the example especially, the one explaining the reason of negative time out fields. For what purpose the software interrupts are used there? Thanks!

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  • R or Python for file manipulation

    - by danspants
    I have 4 reasonably complex r scripts that are used to manipulate csv and xml files. These were created by another department where they work exclusively in r. My understanding is that while r is very fast when dealing with data, it's not really optimised for file manipulation. Can I expect to get significant speed increases by converting these scripts to python? Or is this something of a waste of time?

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  • hibernate for dynamic table creation

    - by user369316
    i AM A HIBERNATE BEGINNER ,Since i need to create dynamic tables with dynamic fields in them i chose to use hibernate . As far as my understanding , creating tables requires a class with the fields defined in the class . How do i generate the classes dynamically based on the table with the required fields ?

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  • In Objective C, is there a way to call reference a typdef enum from another class?

    - by Adrian Harris Crowne
    It is my understanding that typedef enums are globally scoped, but if I created an enum outside of the @interface of RandomViewController.h, I can't figure out how to access it from OtherViewController.m. Is there a way to do this? So... "RandomViewController.h" #import <UIKit/UIKit.h> typedef enum { EnumOne, EnumTwo }EnumType; @interface RandomViewController : UIViewController { } and then... "OtherViewController.m" -(void) checkArray{ BOOL inArray = [randomViewController checkArray:(EnumType)EnumOne]; }

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  • User accounts in Symfony?

    - by gruner
    I'm new to Symfony. Is my understanding correct that the User class is actually for controlling sessions? But is there built-in login and account creation? I'm not finding it. But if there's an admin backend generator, how can it function without user logins?

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  • Why we need to read() before write() in TCP server program?

    - by Naga
    Hi, As per my understanding a simple TCP server will be coded as follows. socket() - bind() - listen() - accept() - read() - write() The clients will be written as follows. socket() - bind()(Optional) - connect() - write() - read() Please note the order difference in read() and write() calls between client and server program. Is it a requirement to always read() before write() in a server program and if, then why? Thanks, Naga

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  • BigInteger.pow(BigInteger) ?

    - by PeterW
    I'm playing with numbers in Java, and want to see how big a number I can make. It is my understanding that BigInteger can hold a number of infinite size, so long as my computer has enough Memory to hold such a number, correct? My problem is that BigInteger.pow accepts only an int, not another BigInteger, which means I can only use a number up to 2,147,483,647 as the exponent. Is it possible to use the BigInteger class as such? BigInteger.pow(BigInteger) Thanks.

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  • Oracle Database Enforce CHECK on multiple tables

    - by GigaPr
    I am trying to enforce a CHECK Constraint in a ORACLE Database on multiple tables CREATE TABLE RollingStocks ( Id NUMBER, Name Varchar2(80) NOT NULL, RollingStockCategoryId NUMBER NOT NULL, CONSTRAINT Pk_RollingStocks Primary Key (Id), CONSTRAINT Check_RollingStocks_CategoryId CHECK ((RollingStockCategoryId IN (SELECT Id FROM FreightWagonTypes)) OR (RollingStockCategoryId IN (SELECT Id FROM LocomotiveClasses))) ); ...but i get the following error: *Cause: Subquery is not allowed here in the statement. *Action: Remove the subquery from the statement. Can you help me understanding what is the problem or how to achieve the same result?

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  • Can NP-Intermediate exist if P = NP?

    - by Jason Baker
    My understanding is that Ladner's theorem is basically this: P != NP implies that there exists a set NPI where NPI is not in P and NPI is not NP-complete What happens to this theorem if we assume that P = NP rather than P != NP? We know that if NP Intermediate doesn't exist, then P = NP. But can NP Intermediate exist if P = NP?

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  • Linux service and Source for cron job

    - by Sirish Kumar
    Hi, I am new to linux and writing a service in C++ which spawns multiple threads and I am starting the service by calling it from init.d, but how should I send the terminate signal to my application from the script , so that my service terminates all the threads and exits. And also where can I find the source code for any linux services. e.g. /etc.init.d/rc5.d/S14cron . It will be helpful in understanding how to implement a service.

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