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  • Split Entire Hash Range Into n Equal Ranges

    - by noxtion
    Hello. I am looking to take a hash range (md5 or sha1) and split it into n equal ranges. For example, if n=5, the entire hash range would be split by 5 so that there would be a uniform distribution of key ranges. I would like n=1 to be from the beginning of the hash range to 1/5, 2 from 1/2 to 2/5, etc all the way to the end. I am new to hashing and a little bit unsure of where I could start on solving this for a project. Any help you could give would be great.

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  • Create categorial variable in R based on range

    - by Stedy
    I have a dataframe with a column of integers that I would like to use as a reference to make a new categorical variable. I want to divide the variable into three groups and set the ranges myself (ie 0-5, 6-10, etc). I tried cut but that divides the variable into groups based on a normal distribution and my data is right skewed. I have also tried to use if/then statements but this outputs a true/false value and I would like to keep my original variable. I am sure that there is a simple way to do this but I cannot seem to figure it out. Any advice on a simple way to do this quickly?

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  • Towards HEATMAP representation - R -

    - by user3710390
    I am trying to plot a simple heatmap of some data distribution in R. My data = matrix (5000 x3( Time , Complexity, Localisation )). Time ( 0- 7000) Cmplx (0-4) Localisation (1-15). i.e Time Cmplx Localisation 567 3 1 54 0 2 345 3 12 567 4 12 345 2 9 989 4 7 ... ... ... The idea is to plot the Time in relation to each Cmplx and each Localisation (Something like accumarray in mathlab) Have someone an idea? Thanks in advance, Guillon_

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  • The fundamentals of Hash tables?

    - by kylex
    I'm quite confused about the basic concepts of a Hash table. If I were to code a hash how would I even begin? What is the difference between a Hash table and just a normal array? Basically if someone answered this question I think all my questions would be answered: If I had 100 randomly generated numbers (as keys), how would I implement a hash table and why would that be advantageous over an array? Psuedo-code or Java would be appreciated as a learning tool...

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  • Export from a standalone database to an embedded database.

    - by jdana
    I have a two-part application, where there is a central database that is edited, and then at certain times, the data is released and distributed as its own application. I would like to use a standalone database for the central database (MySQL, Postgres, Oracle, SQL Server, etc.) and then have a reliable export to an embedded database (probably SQLite) for distribution. What tools/processes are available for such an export, or is it a practice to be avoided? EDIT: A couple of additional pieces of information. The distributed application should be able to run without having to connect to another server (ex: your spellchecker still works even you don't have internet), and I don't want to install a full DB server for read-only access to the data.

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  • How should I interpret site analytics with 11 pageviews in an 3 second visit?

    - by Juank
    I'm using google analytics and recently i've noticed some weird trends going on. I have a lot of visits that last mere seconds but mark several page views... more than a normal human can see in that range of time. A specific case is that the only visitor from Ireland i've had until now recorded 11 pageviews in a 3 second visit. Are these crawlers? Shouldn't google analytics filter those out?

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  • check if sqlserver is installed on a machine thro C#

    - by Skun
    Hey ! I am making an application which is a user interface to access 2 types of databases - SQLite and MSSQL server. The thing is, SQLite doesnt need to be "installed" since its just a flatfile database, but on the other hand, SQLserver (Express/normal) need to be installed before use. My Question is simple: Is there a way by which i can find out if an instance of SQLserver has been installed on the local machine by using a C# program?

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  • What happens when I MPI_Send to a process that has finished?

    - by nieldw
    What happens when I MPI_Send to a process that has finished? I am learning MPI, and writing a small sugar distribution-simulation in C. When the factories stop producing, those processes end. When warehouses run empty, they end. Can I somehow tell if the shop's order to a warehouse did not succeed(because the warehouse process has ended) by looking at the return value of MPI_Send? The documentation doesn't mention a specific error code for this situation, but that no error is returned for success. Can I do: if (MPI_Send(...)) { ... /* destination has ended */ ... } And disregard the error code? Thanks

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  • What does it mean when a ByteInputStream keeps returning 0?

    - by Zombies
    I have a ByteInputStream, created from a Socket in Java. The connection is to a simple web server that uses chunked transfer encoding. The web server does in fact work in normal browser. But in my program, I am attempting to read, I read the first first bytes (some 5kb of data). But each read after that returns 0 bytes read. Isn't it supposed to block until it can read?

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  • Java overloading and overriding

    - by Padmanabh
    We always say that method overloading is static polymorphism and overriding is runtime polymorphism. What exactly do we mean by static here? Is the call to a method resolved on compiling the code? So whats the difference between normal method call and calling a final method? Which one is linked at compile time?

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  • How to start an activity Dialog.

    - by PP
    I have one activity which i am using for displaying Dialogs and as a normal layout. So what i want to do is, sometimes i want to start activity as Theme Dialog and some times using setContentView. I can't use <activity android:theme="@android:style/Theme.Dialog"> in manifest file as it will always display activity as dialog. So can we do it programmatic, i have also tried setTheme() method but it did't work. Thanks, PP.

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  • How to show tab character while using expandtab setting?

    - by Plugawy
    In my .gvimrc I have following lines: set listchars=tab:\.\ ,trail:- set softtabstop=2 set shiftwidth=2 set tabstop=2 set expandtab When I change last line to set noexpandtab the indents can be seen and marked with . Is there a way to make vim treat expanded tabs like "normal" tab so that list option works as expected?

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  • Hiernate's version values in Grails app

    - by xain
    Hi, looking at a database dump file, and I see many records in various tables with their version number set in values other than 0 (even 94 in one case). I understand it has to do with hibernate locking strategy, but my concern is that today is Sunday, and the site has almost no visitors so is: is this normal ? Or is there a known hibernate bug or even some programming malpractice producing this ? Thanks in advance.

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  • An html5 canvas element in the background of my page?

    - by fx42
    Is it possible to have a full screen canvas element in the background of a webpage and "normal" markup elements like a table in front of it? like the following snippet (if it wouldn't be used as alternative content): <canvas id=&#34;imageView&#34; width=100%; height=100%;> <table>...</table> </canvas>

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  • Text overlap div

    - by newinjs
    Hello, I have a comment box, if they enter long one word, "aaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaa" the box will break(text out of div), i have used overflow:hidden but my friend want it to break like normal text. Any idea how to fix ?

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  • jquery loop hover button

    - by john morris
    ok i have 6 buttons, im trying to have a jquery listener for when you hover over one of the 6 buttons, it changes class. im using a for loop to do this, heres my code: $(document).ready(function() { for($i=1;$i<7;$i++) { $('#button'+i).hover(function() { $(this).addClass('hovering'); }, function() { $(this).removeClass('normal'); }); } }); each button has an id of "buttonx" ( the x being a number ) help?

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  • Does the OS make a significant difference for Ruby Development ?

    - by Bragaadeesh
    Hi, I have been working in Java for the past 4 years and I am currently switching over to Ruby. I am so excited about it and I feel good to finally get a hands on experience on a scripting language first time. The task assigned to me is to first pick a OS of my choice and setup a Ruby in it and study for 2 weeks. I have been developing applications in windows and Linux is not my cup of tea. Some part of me wants to try out Linux but I want to first convince myself whether OS really matters for Ruby development. If Linux does matter, which distribution can I start looking at? Please advise.

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  • if curl getinfo for HTTP CODE is not returning a code!?

    - by jtanmay
    Hi, I am doing a normal curl call to a webservice and I grab the return HTTP code through $code = curl_getinfo ($ch, CURLINFO_HTTP_CODE); It does return me $code as 200 - which is good. But logging the curl calls now from a week, there where few calls to the same webservice which didn't return anything! so basically I am getting $code as blank. Can someone tell me what should be going wrong under those scenarios, and if can debug it more!? Thanks, Tanmay

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