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• Pomodoro technique & other ways to increase personal productivity

  - by Jayson

  I recently came across the Pomodoro Technique as a way to increase productivity, get in the zone, and in general feel a sense of accomplishment at setting some short programming goals and achieving them. So far I have enjoyed it and the sense of accomplishment I get after seeing a bunch of short goals add up at the end of the day to a lot of work done on a programming project. What other ideas, similar or not, add a little variety to achieving goals, personal productivity, get in the programming zone, and so forth? What ideas or techniques are expressed formally, such as those in the Pomodoro paper, rather than trite maxims?

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• Why are difference lists more efficient than regular concatenation?

  - by Craig Innes

  I am currently working my way through the Learn you a haskell book online, and have come to a chapter where the author is explaining that some list concatenations can be ineffiecient: For example ((((a ++ b) ++ c) ++ d) ++ e) ++ f Is supposedly inefficient. The solution the author comes up with is to use 'difference lists' defined as newtype DiffList a = DiffList {getDiffList :: [a] -> [a] } instance Monoid (DiffList a) where mempty = DiffList (\xs -> [] ++ xs) (DiffList f) `mappend` (DiffList g) = DiffList (\xs -> f (g xs)) I am struggling to understand why DiffList is more computationally efficient than a simple concatenation in some cases. Could someone explain to me in simple terms why the above example is so inefficient, and in what way the DiffList solves this problem?

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• openmp program elapsed time not scaling with increased threads

  - by Griff

  I've got this openmp fortran program doing an embarrassingly parallel problem - do loop over 512^3 elements. See output below. Why would there be such strange behavior in the elapsed time as a function of threads? I thought it would peak at a sweet spot then slowly degrade. This clearly isn't happening. Perhaps I misunderstand something about openmp. Threads, omp_get_wtime 1, 103.76298500015400 2, 65.346454000100493 4, 45.923643999965861 7, 38.074195000110194 8, 36.968765000114217 9, 39.45981499995105 10,40.753379000118002 12,39.577559999888763 14,37.909950000001118

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• php code execution time

  - by Bharanikumar

  Hi How to find my code execution time , Am using the below snippet, am not happy with that ? list ($msec, $sec) = explode(' ', microtime()); $microtime = (float)$msec + (float)$sec; Regards

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• Android OS 2.2 Permissions: I have absolutely no idea why this simple piece of code doesn't work. Wh

  - by Kevin

  I'm just playing around with some code. I create an Activity and simply do something like this: long lo = currentTimeMillis(); System.out.println(lo); lo *= 3; System.out.println(lo); SystemClock.setCurrentTimeMillis(lo); System.out.println( currentTimeMillis() ); Yes, in my AndroidManifest.xml, I've added: <uses-permission android:name="android.permission.SET_TIME"></uses-permission> <uses-permission android:name="android.permission.SET_TIME_ZONE"></uses-permission> Nothing changes. The SystemClock is never reset...it just keeps on ticking. The error that I'm getting just says that the permission "SET_TIME" was not granted to the program. Protection level 3. The permissions are there...and in the API for 2.2 it says that this feature is supported now. I have no idea what I'm doing wrong. If android.content.Intent; comes into play, please explain. I don't really understand what the idea behind intents! Thanks for any help!

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• Either or has to have a value but both can't be null at the same time

  - by Coppermill

  I have two fields and I need to generate an attribute, using Microsoft Enterprise Library validation, so that either or has to have a value, but both can not be null at the same time.

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• Run time Debugging

  - by Prakash

  We have recently downloaded, installed and compiled gcc-3.0.4 code. gcc compiler has built successfully and we where able to compile some same test cpp file. I would like to know how we can modify gcc source code so that we add additional run time debugging statements like the binary in execution compiled by my gcc should print below statement in a log file: filename.cpp::FunctionName#linenumber-statement or any additional information that I can insert via this tailored compiler code Any references would be highly appreciable.

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• real time scenario between interface/abstract class ?

  - by JavaUser

  Hi , Please give me a real time simple example for the below questions : Where to use interface rather abstract class Where to use abstract class rather interface I need code snippet for both . Which takes low memory and which performs well . Do I need to consider the design aspect also? What is the conceptual difference not the syntactical difference .

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• What data is actually stored in a B-tree database in CouchDB?

  - by Andrey Vlasovskikh

  I'm wondering what is actually stored in a CouchDB database B-tree? The CouchDB: The Definitive Guide tells that a database B-tree is used for append-only operations and that a database is stored in a single B-tree (besides per-view B-trees). So I guess the data items that are appended to the database file are revisions of documents, not the whole documents: +---------|### ... | | +------|###|------+ ... ---+ | | | | +------+ +------+ +------+ +------+ | doc1 | | doc2 | | doc1 | ... | doc1 | | rev1 | | rev1 | | rev2 | | rev7 | +------+ +------+ +------+ +------+ Is it true? If it is true, then how the current revision of a document is determined based on such a B-tree? Doesn't it mean, that CouchDB needs a separate "view" database for indexing current revisions of documents to preserve O(log n) access? Wouldn't it lead to race conditions while building such an index? (as far as I know, CouchDB uses no write locks).

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• System call time out?

  - by Arnold

  Hi, I'm using unix system() calls to gunzip and gzip files. With very large files sometimes (i.e. on the cluster compute node) these get aborted, while other times (i.e. on the login nodes) they go through. Is there some soft limit on the time a system call may take? What else could it be?

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• SEC_TO_TIME() convert to java.sql.Time error

  - by chun

  hi I have a aggregate column present the microsecond, a report(with jasper) have to show HH:mm:ss of this indicator What I did is using SEC_TO_TIME(sum(col)/1000) , but when mapping to java.sql.Time, i doesn't work when the value of hour in result pass over 24(ex:36:33:33) Then I think another way, not using sec_to_time, just mapping the microsecond as Bigdecimal, but dunno what java class shoud i use to format date as the default format of hh:mm:ss is limit to 24...?

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• iPhone Battery Time with GPS

  - by Mustafa

  What's the battery time of iPhone 3G and 3Gs with GPS active? I'm getting approx. 2 hours of battery life with active GPS (Note: I'm using my own App).

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• Why Firebug Sucks At Real Time Html Editing?

  - by David

  Hi, i always like to real-time edit a web page source in the browser and updated as i type, but firebug really sucks, i can't insert scripts in the current page, some times the changes i type aren't updated at all, Is there any robust firefox/chrome extension for that? i try to temporarely edit/add code to an existing web page in the internet, not a local one Thanks

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• Oracle row change time stamp

  - by IMHO

  Is there a system column - timestamp - in Oracle table to determine when was it changed last time? I would assume there must be one to let mat views pull changes only ...

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• How can I speed up the compile / publish time of Flash IDE projects

  - by Iain

  I'm sick of waiting hours for Flash to publish. .NET / VisualStudio projects are WAAAAY faster - is that only compiling the classes that have changed? Update: Does the Flash IDE re-encode all your sounds and images every time you publish? Can't it cache them somewhere?

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• Remaining time in inno-setup

  - by Toda Raba

  Hi. I'm using inno-setup and I want to display the remaining time of the installation process. Is there any option to show it?

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• Deactivate Air app created in AS3 after next monday?

  - by Carlos Barbosa

  Hi, i have an application deployed in Air, written in AS3 that client wants to install and test, i have developed a simple license app, but he is pushing for a full license witch he said he will fully paid on next monday. How would you create a procedure in AS3 to deactivate application next monday? How secure will it be? will simply changing machine date will bypass this?

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• Reduce resource usage of an Idle task

  - by S.M

  I find that in uC/OS-II RTOS, there is an idle task that gets executed when no other task is ready to run. If an idle task can consume resources, how can we reduce it ?

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• Change library load order at run time (like LD_PRELOAD but during execution)

  - by tylerl

  How do I change the library a function loads from during run time? For example, say I want to replace the standard printf function with something new, I can write my own version and compile it into a shared library, then put "LD_PRELOAD=/my/library.so" in the environment before running my executable. But let's say that instead, I want to change that linkage from within the program itself. Surely that must be possible... right?

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• failure on creating a Scikits.TimeSeries object

  - by user311906

  Hi All I am trying to create a scikit.timeseries object starting from 2 datetime objects. If I understood correctly it should be possible to create a scikits.timeseries starting from datetime objects. I try the following code but it says that Insufficient parameters. The 2 datetime differs for few microseconds. In this case what should be the value for freq parameter? Is what I am trying allowed? In theory, since timeseries can be based on datetime objects it should be possible to hanlde up to microsecond , is this correct? I think that this is not really clear to me. Regards Eo import datetime import sckilits.timeseries as ts tm1 = datetime.datetime( 2010,1,1, 10,10,2, 123456 ) tm2 = datetime.datetime( 2010,1,1, 10,10,2, 345678 ) d = [ tm1, tm2 ] tseries = ts.time_series( dates=d ) tseries = ts.time_series( d )

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• openssl_public_encrypt encrypted data is every time different

  - by panny

  why is the content of $encrpyted every time different? // aquire public key from server $server_public_key = openssl_pkey_get_public(file_get_contents("C:\publickey.pem")); // rsa encrypt openssl_public_encrypt("123", $encrypted, $server_public_key);

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• javascript unixtime one minute in front

  - by cocacola09

  Hi I'm passing a unixtimestamp to a javascript IF statement, can anyone tell me how to generate a unixtimestamp one minute in the future with javascript. Anyhelp would be helpful. Thanks

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• Biggest performance improvement you've had with the smallest change?

  - by JoelFan

  What's the biggest performance improvement you've had with the smallest change? For example, I once improved the performance of a certain page on a high-profile web app by a factor of 10, just by moving "where customerID = ?" to a different place inside a complicated SQL statement (before my change it had been selecting all customers in a join, then later selecting out the desired customer).

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• Console.SetWindowPosition -> centered (each and every time)

  - by manny

  I'm trying to set the Console window executed via my C-sharp code to be centered each and every time code is generated. I hope that makes sense. I thank you guys in advance.

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• Formatting time in milliseconds using boost::date_time library

  - by Ylisar

  I have a time duration in milliseconds which I ideally would like to format using the formatting functionality present in the boost::date_time library. However, after creating a boost::posix_time::time_duration I can't seem to find a way to actually apply the formatting string to it.

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