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• matplotlib.pyplot, preserve aspect ratio of the plot

  - by Headcrab

  Assuming we have a polygon coordinates as polygon = [(x1, y1), (x2, y2), ...], the following code displays the polygon: import matplotlib.pyplot as plt plt.fill(*zip(*polygon)) plt.show() By default it is trying to adjust the aspect ratio so that the polygon (or whatever other diagram) fits inside the window, and automatically changing it so that it fits even after resizing. Which is great in many cases, except when you are trying to estimate visually if the image is distorted. How to fix the aspect ratio to be strictly 1:1? (Not sure if "aspect ratio" is the right term here, so in case it is not - I need both X and Y axes to have 1:1 scale, so that (0, 1) on both X and Y takes an exact same amount of screen space. And I need to keep it 1:1 no matter how I resize the window.)

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• Java's ThreadPoolExecutor equivalent for C#?

  - by chillitom

  Hi Guys, I used to make good use of Java's ThreadPoolExecutor class and have yet to find a good equivalent in C#. I know of ThreadPool.QueueUserWorkItem which is useful in many cases but no good if you want to control the number of threads assigned to a task or have multiple individual queues for different task types. For example I liked to use a ThreadPoolExecutor with a single thread to guarantee sequential execution of asynchronous calls.. Is there an easy way to do this in C#? Is there a non-static thread pool implementation? Thanks, T.

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• AsyncTask and onDestroy...

  - by stormin986

  I have an activity initiate a few AsyncTask downloads. After two of the three finish, it issues an Intent to load the next activity while still finishing up the last download. Obviously in onDestroy() i will call cancel() on all AsyncTask objects. If the OS tries to destroy my activity after the next activity starts, it will call and begin executing onDestroy in the apps UI thread, right? It won't wait for that AsyncTask to complete, correct? In all cases it will ultimately call onDestroy(), in turn canceling all AsyncTasks?

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• performance of parameterized queries for different db's

  - by tuinstoel

  A lot of people know that it is important to use parameterized queries to prevent sql injection attacks. Parameterized queries are also much faster in sqlite and oracle when doing online transaction processing because the query optimizer doesn't have to reparse every parameterized sql statement before executing. I've seen sqlite becoming 3 times faster when you use parameterized queries, oracle can become 10 times faster when you use parameterized queries in some extreme cases with a lot of concurrency. How about other db's like mysql, ms sql, db2 and postgresql? Is there an equal difference in performance between parameterized queries and literal queries?

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• Recommended Python publish/subscribe/dispatch module ?

  - by Eli Bendersky

  From PyPubSub: Pypubsub provides a simple way for your Python application to decouple its components: parts of your application can publish messages (with or without data) and other parts can subscribe/receive them. This allows message "senders" and message "listeners" to be unaware of each other: one doesn't need to import the other a sender doesn't need to know "who" gets the messages, what the listeners will do with the data, or even if any listener will get the message data. similarly, listeners don't need to worry about where messages come from. This is a great tool for implementing a Model-View-Controller architecture or any similar architecture that promotes decoupling of its components. There seem to be quite a few Python modules for publishing/subscribing floating around the web, from PyPubSub, to PyDispatcher to simple "home-cooked" classes. Can you recommend a module that works well in most cases ? Which modules have you had positive experience with ? Negative ? Thanks in advance

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• Is "non breaking change" a common term in revision control?

  - by mafutrct

  Non breaking change is a term used to describe minor contributions which are supposed to not break anything and is abbreviated as NBC. Typical example include formatting a source file or adding a comment - it really, really should not break the build (of course there are always exceptional cases). Is this a common term in revision control talk? I'm especially asking those familiar with RC systems. I use "NBC" on occasion but I never heard anyone else using it so I wondered... (btw: Don't trust wikipedia as a source on this)

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• What is the cost in bytes for the overhead of a sql_variant column in SQL Server?

  - by Elan

  I have a table, which contains many columns of float data type with 15 digit precision. Each column consumes 8 bytes of storage. Most of the time the data does not require this amount of precision and could be stored as a real data type. In many cases the value can be 0, in which case I could get away with storing a single byte. My goal here is to optimize space storage requirements, which is an issue I am facing working with a SQL Express 4GB database size limit. If byte, real and float data types are stored in a sql_variant column there is obviously some overhead involved in storing these values. What is the cost of this overhead? I would then need to evaluate whether I would actually end up in significant space savings (or not) switching to using sql_variant column data types. Thanks, Elan

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• Eclipse doesn't see my new junit test

  - by morgancodes

  I'm using eclipse to run the tests in a single junit(4) test class. The tests in the class all run just fine. Then I add an additional test and run the class through the test running in ecplise again. Only the old tests are run. The new test isn't seen by eclipse. There's no error or anything, it's just as if eclipse is looking at an old version of the test. If I run the tests using maven, everything works fine. Additionally, after I run the tests in maven, ecplipse can see and run the new test correctly. Any ideas what's going on? Any ideas how to get ecplipse's test runner to see my new test cases?

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• SQL Server 2008 - Search Query

  - by user208662

  Hello, I am not a SQL Expert. I’m trying to elegantly solve a query problem that others have had to have had. Surprisingly, Google is not returning anything that is helping. Basically, my application has a “search” box. This search field will allow a user to search for customers in the system. I have a table called “Customer” in my SQL Server 2008 database. This table is defined as follows: Customer UserName (nvarchar) FirstName (nvarchar) LastName (nvarchar) As you can imagine, my users will enter queries of varying cases and probably mis-spell the customer’s names regularly. How do I query my customer table and return the 25 results that are closest to their query? I have no idea how to do this ranking and consider the three fields listed in my table. Thank you!

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• Is a class that is hard to unit test badly designed?

  - by Extrakun

  I am now doing unit testing on an application which was written over the year, before I started to do unit-testing diligently. I realized that the classes I wrote are hard to unit test, for the following reasons: Relies on loading data from database. Which means I have to setup a row in the table just to run the unit test (and I am not testing database capabilities). Requires a lot of other external classes just to get the class I am testing to its initial state. On the whole, there don't seem to be anything wrong with the design except that it is too tightly coupled (which by itself is a bad thing). I figure that if I have written automated test cases with each of the class, hence ensuring that I don't heap extra dependencies or coupling for the class to work, the class might be better designed. Does this reason holds water? What are your experiences?

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• Jenkins merge dev branch to master with -Xtheir stategy

  - by Pandya M. Nandan

  In GIT Plugin, we can merge one branch to other on work space before the starting of Build. However, plugin does not provide -Xtheir strategy. Now i want dev branch to merge on master, validate test cases and if successful then only push back to master. Problem i face is that if there is a merge conflict, i want changes of dev branch to exits (i know i can use -Xtheirs manually). [Like i can check git as Source Code Management, but can;t use its Additional behavior 'Merge Before Build' ] However when i run the required code in Execute Shell Section of Jenkins Job, It does not works as required and fails with error: fatal: dev - not something we can merge Jenkins Job Code is echo Start of Build git checkout dev git checkout master git status git merge dev --no-commit echo End of Build I have also used them with bask -l -c "", but is same problem.

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• How do I save a copy of the clipboard and then revert back to it?

  - by cksubs

  I'm reading words in a text box by simulating the key presses required to highligh and copy the text. When I'm done, I want the clipboard to be exactly how I found it. I was hoping I'd be able to do something like this: IDataObject clipboardBackup = Clipboard.GetDataObject(); Clipboard.Clear(); //Save other things into the clipboard here, etc// Clipboard.SetDataObject(clipboardBackup); But that doesn't seem to work. It looks like you can go the route of specifically trying for text, audio, pictures, etc. and then saving them accordingly. (I guess 'data object' is specialized like that in my example too, I was hoping it was generic.) I'd prefer not to use cases for every possible type of clipboard data, both to be more concise and to make sure I never lose the data regardless of format. Any tips for grabbing any and all of the clipboard and then restoring it?

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• Remove trailing slash from comment form

  - by Sergio Vargott

  and i really need a code to remove the ending slash when a user put their link. for example i need them to put their url to grab their avatar, but in some cases they put their url ending with a slash (.com/) how can i remove that slash automatically? because when they put their url like that the avatar doesn't show i need them to end like this (.com) in order to show their avatar. I was looking for a remove trailing slash php code, but any solution will be appreciated. i tried to use this code but didn't work $string = rtrim($string, '/');

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• ASP.NET MVC: run code after view has rendered (close db transaction)

  - by thermal7

  Hi, I am using ASP.NET MVC2 with NHibernate, but am facing an issue. All calls to the database via NHibernate should be inside a transaction, however code inside the view kicks off database calls in some instances. Thus there is a need to be able to commit the transaction after the view has rendered. For example displaying a list of users and their user roles you might show the user role using this code: <%: Model.UserRole.Name % This will cause a hit on the database as the UserRole is loaded using a NHibernate proxy. You can fetch the UserRole eagerly which circumvents the issue in this case, but there are cases where it is much faster to use lazy loading. Anyway, is there a way to run code after a view has rendered?

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• SQL Server Query Editors - any that warn of number of rows to be changed?

  - by ciaranarcher

  We're using SQL Server 2000 Query Analyser, and one issue we have is that very occasionally, when a user is updating our live database, they insert the incorrect/no(!) where clause. I know, not good, but it happens. Are there any editors that will warn of the number of rows that might be changed (if that is even possible) or even a way to configure an editor, if it is connected to a certain database, to prompt for confirmation before the query is run? We have a way to recover our data in the cases where we run an incorrect query, but it takes time, and I'm just seeing if there are any ways to catch the error, or at least give the user a second chance. Thanks in advance.

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• return by reference - which of the two is the correct one

  - by eriks

  i have the function: const A& f(...) {...} a. const A a1 = f(..); b. const A &a2 = f(...); which of the is the better one to use? in both cases, if i understand correctly, i prevent the possibility of modifying the returned object. in the first option, the copy constructor of A will be called - am i correct?

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• Using Apache Velocity with StringBuilders/CharSequences

  - by mindas

  We are using Apache Velocity for dynamic templates. At the moment Velocity has following methods for evaluation/replacing: public static boolean evaluate(Context context, Writer writer, String logTag, Reader reader) public static boolean evaluate(Context context, Writer out, String logTag, String instring) We use these methods by providing StringWriter to write evaluation results. Our incoming data is coming in StringBuilder format so we use StringBuilder.toString and feed it as instring. The problem is that our templates are fairly large (can be megabytes, tens of Ms on rare cases), replacements occur very frequently and each replacement operation triples the amount of required memory (incoming data + StringBuilder.toString() which creates a new copy + outgoing data). I was wondering if there is a way to improve this. E.g. if I could find a way to provide a Reader and Writer on top of same StringBuilder instance that only uses extra memory for in/out differences, would that be a good approach? Has anybody done anything similar and could share any source for such a class? Or maybe there any better solutions to given problem?

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• Linux - How do i know the block map of the given file and/or the free space map of the partition.

  - by Inso Reiges

  Hello, I am on Linux and need to know either of the two things: 1) If i have a regular file on some file system on a partition under Linux is there a way to know the set of the physical blocks that this file occupies on the drive from user space? Or at least the set of the file system's clusters? 2) Is there a way to get the same information about the whole free space of the given file system? In both cases i understand that if there is any possible way to extract this info it will probably be totally unsafe and racy (anything could happen to these set of blocks between the time i see them and act on them somehow). I also really don't want an implementation that will have to know a lot about every filesystem.

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• can oracle types be updated like tables?

  - by Omnipresent

  I am converting GTT's to oracle types as explained in an excellent answer by APC. however, some GTT's are being updated based on a select query from another table. For example: UPDATE my_gtt_1 c SET (street, city, STATE, zip) = (SELECT src.unit_address, src.unit_city, src.unit_state, src.unit_zip_code FROM (SELECT mbr.ROWID row_id, unit_address, RTRIM(a.unit_city) unit_city, RTRIM(a.unit_state) unit_state, RTRIM(a.unit_zip_code) unit_zip_code FROM table_1 b, table_2 a, my_gtt_1 mbr WHERE type = 'ABC' AND id = b.ssn_head AND a.h_id = b.h_id AND row_id >= v_start_row AND row_id <= v_end_row) src WHERE c.ROWID = src.row_id) WHERE state IS NULL OR state = ' '; if my_gtt_1 was not a global temporary table but an oracle collection type then is it possible to do updates this complex? Or in these cases we are better off using the global temporary table?

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• Managing changes in memory-based data format

  - by kamziro

  So I've been using a compact data type in c++, and saving from memory or loading from the file involves just copying the bits of memory in and out. However, the obvious drawback of this is that if you need to add/remove elements on the data, it becomes kind of messy. There's also problems with versioning, suppose you distribute a program which uses version A of the data, and then the next day you make version B of it, and then later on version C. I suppose this can be solved by using something like xml or json. But suppose you can't do that for technical reasons. What is the best way to do this, apart from having to make different if cases etc (which would be pretty ugly, I'd imagine)

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• Is it valid to replace http:// with // in a <script src="http://...">?

  - by Darryl Hein

  I have the following tag: <script type="text/javascript" src="https://cdn.example.com/js_file.js"></script> In this case the site is HTTPS, but the site may also be just HTTP. (The JS file is on another domain.) I'm wondering if it's valid to do the following for convenience sake: <script type="text/javascript" src="//cdn.example.com/js_file.js"></script> I'm wondering if it's valid to remove the http: or https: ? It seems to work everywhere I have tested, but are there any cases where it doesn't work?

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• Why can't I save CSS changes in FireBug?

  - by Dean

  FireBug is the most convenient tool I've found for editing CSS - so why isn't there a simple "Save" option? I am always finding myself making tweaks in FireBug, then going back to my original .css file and replicating the tweaks. Has anyone come up with a better solution? EDIT: I'm aware the code is stored on a server (in most cases not my own), but I use it when building my own websites. Firebug's just using the .css file FireFox downloaded from the server, it knows precisely what lines in which files its editing, I can't see why there's not an "Export" or "Save" option which allows you to store the new .css file. (Which I could then replace the remote one with). I have tried looking in temporary locations, and choosing file-save and experimenting with the output options on FireFox, but I still haven't found a way. Here's hoping someone has a nice solution... EDIT 2: The Official Group has a lot of questions, but no answers.

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• How Do I See The Final Text Of A Query Resulting From A Call To mysqli->prepare?

  - by Joshua

  After code like this: $stmt = $mysqli->prepare("SELECT District FROM City WHERE Name=?")) { $stmt->bind_param("s", $city); $stmt->execute(); $stmt->bind_result($district); $stmt->fetch(); printf("%s is in district %s\n", $city, $district); How Do I See The Actual SQL Statement That Was Executed? (It Should Look Something Like "SELECT District FROM City WHERE Name='Simi Valley';") I already realize that in this simplistic case it would be very easy to simply reconstruct the query... but how can I access it in a general way that will work for very complicated prepared statements, and cases where I don't necessarily already understand the intended structure of the query, etc. Isn't there some function or method that can be called on the statement object that will return the actual text of the SQL query, after binding?

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• Strategy for developing namespaced and non-namespaced versions of same PHP code

  - by porneL

  I'm maintaining library written for PHP 5.2 and I'd like to create PHP 5.3-namespaced version of it. However, I'd also keep non-namespaced version up to date until PHP 5.3 becomes so old, that even Debian stable ships it ;) I've got rather clean code, about 80 classes following Project_Directory_Filename naming scheme (I'd change them to \Project\Directory\Filename of course) and only few functions and constants (also prefixed with project name). Question is: what's the best way to develop namespaced and non-namespaced versions in parallel? Should I just create fork in repository and keep merging changes between branches? Are there cases where backslash-sprinkled code becomes hard to merge? Should I write script that converts 5.2 version to 5.3 or vice-versa? Should I use PHP tokenizer? sed? C preprocessor? Is there a better way to use namespaces where available and keep backwards compatibility with older PHP?

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• Assigning a view controller to be the delegate of a subview which is not directly descendent?

  - by ambertch

  I am writing an iphone app where in numerous cases a subview needs to talk to its superview. For example: View A has a table view that contains photos A has a subview B which allows users to add photos, upon which I want to auto append them to A's table view So far I have been creating a @protocol in B, and registering A as the delegate. The problem in my case is that B has a subview C that allows users to add content, and I want actions in C to invoke changes in its grandparent, A. Currently I am working around this by passing around a self pointer to my base view controller (C.delegate = B.delegate), but it doesn't seem very proper to me. Any thoughts? (and/or general advice on code organization when all sort of subviews needs to talk to superviews would be greatly appreciated) Thanks!

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