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  • Initialize array in O(1) -- how is this trick called?

    - by user946850
    There is this pattern that trades performance of array access against the need to iterate it when clearing it. You keep a generation counter with each entry, and also a global generation counter. The "clear" operation increases the generation counter. On each access, you compare local vs. global generation counters; if they differ, the array

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  • Java HashSet key/value pair

    - by harley
    Why does Java not provide functions to get at the key/value pairs in a HashSet like in Hashtable? It seems like a real pain to have to iterate over it every time you need to get at something. Or am I just a newb missing something?

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  • WCF chunking/streaming - make it transparent for client

    - by bybor
    While developing WCF service i've faced problem of transferring large data as method params ( 4 Mb of raw size, not considering transfer/message overhead). The solution for this problem is to use chunking or streaming, but all the samples i've seen assume client is aware of used method and uses available block size for sending/receiving

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  • Why is a DataGridView so row-centric.

    - by Spike
    Why is there a DataGridViewRow.Cells property, but not a DataGridViewColumn.Cells property? What's so important about rows that I'll never want to iterate down a column? I'm not saying that it makes it particularly difficult to do or anything, it just strikes me as oddly asymmetrical. I'm implementing a "fill down" type behaviour, and

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  • MSBuild's XmlMassUpdate task in NAnt?

    - by veljkoz
    I have created an MSBuild tasks for building my projects, but for various reasons I wan't to switch to NAnt. Is there some task that would be equivalent to MSBuild's XmlMassUpdate in NAnt? If possible I would like to use the same xml replacement file I used with XmlMassUpdate. (for more info about XmlMassUpdate, here's a short usage I

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  • parse json with ant

    - by paleozogt
    I have an ant build script that needs to pull files down from a web server. I can use the "get" task to pull these files down one by one. However, I'd like to be able to get a list of these files first and then iterate over the list with "get" to download the files. The webserver will report the list of files in json format, but I'm

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  • Sequence reduction in R

    - by drknexus
    Assume you have a vector like so: v <- c(1,1,1,2,2,2,2,1,1,3,3,3,3) How can it be best reduced to a data.frame like this? v.df <- data.frame(value=c(1,2,1,3),repetitions=c(3,4,2,4)) In a procedural language I might just iterate through a loop and build the data.frame as I go, but with a large dataset in R such an approach

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  • create parent child array from inline data in php

    - by abhie
    actually i have simple problem but i forget how to solve it.. :D i have data on table with following format 01 Johson 01 Craig 01 Johson 02 Daniel 01 Johson 03 Abbey 02 Dawson 01 Brown 02 Dawson 02 Agust 03 Brick 01 Chev 03 Brick 01 Flinch so i want it to become an array like this 01 Johson => 01 Craig ``````````````02

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  • Complex sorting of XML subnodes in .Net3.5 onwards

    - by MicMit
    XML structure expressed in Xpath kind of Records/Record/Actions/Action/ActionDate the other node on the same level Records/Record/Actions/Action/CTCDate Is there easy or not easy way to sort it on "order by ActionDate,CTCDate" ( in SQL notation ), but per Actions for each selected Record when we iterate somehow ( not per XML

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  • sort associative array in awk - help?

    - by Richard
    Hi all, I have an associative array in awk that gets populated like this... chr_count[$3]++ When I try to print my chr_counts I use this: for (i in chr_count) { print i,":",chr_count[i]; } But not surprisingly, the order of i is not sorted in any way. Is there an easy way to iterate over the sorted "keys" of chr_count?

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  • Hbase / Hadoop Query Help

    - by zechariahs
    I'm working on a project with a friend that will utilize Hbase to store it's data. Are there any good query examples? I seem to be writing a ton of Java code to iterate through lists of RowResult's when, in SQL land, I could write a simple query. Am I missing something? Or is Hbase missing something?

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  • Ruby data structure to render a certain JSON format

    - by dt
    [{"id":"123","name":"House"}, {"id":"1456","name":"Desperate Housewives"}, {"id":"789","name":"Dollhouse"}, {"id":"10","name":"Full House"} ] How can I render to produce this JSON format from within Ruby? I have all the data from the DB (@result) and don't know what data structure to use in Ruby that will render to this when I

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  • Pass array to client side for display

    - by Skoder
    Hey, I have an array which contains around 50-200 hyperlinks. How can I pass this array to the client-side so that I can iterate through the array and display each hyperlinks as a list item? The array will be stored in 'Application' as it's system wide and rarely changes. Could there be a more efficient way of achieving the

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  • Python dealing with dates and times

    - by randombits
    I'm looking for a solution to the following: Given today's date, figure out what month was before. So 2 should return for today, since it is currently March, the third month of the year. 12 should return for January. Then based on that, I need to be able to iterate through a directory and find all files that were created

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