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  • Setup a https client in Java

    - by Albinoswordfish
    I'm very new to HTTPS/SSL so excuse my lack of knowledge. Right now I'm trying to setup a simple Java client in which it connects to a web server through HTTPS. I've seen some example code online but can't seem to really make sense of it. Also I was wondering if there is a difference between setting it up on a Windows machine compared to another type of OS. If anybody knows a good tutorial on this or can head me towards the right direction it would be appreciated.

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  • $1 vs \1 in Perl regex substitutions

    - by Mr Foo Bar
    I'm debugging some code and wondered if there is any practical difference between $1 and \1 in Perl regex substitutions For example: my $package_name = "Some::Package::ButNotThis"; $package_name =~ s{^(\w+::\w+)}{$1}; print $package_name; # Some::Package This following line seems functionally equivalent: $package_name =~ s{^(\w+::w+)}{\1}; Are there subtle differences between these two statements? Do they behave differently in different versions of Perl?

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  • When should I use git pull --rebase?

    - by Jason Baker
    I know of some people who use git pull --rebase by default and others who insist never to use it. I believe I understand the difference between merging and rebasing, but I'm trying to put this in the context of git pull. Is it just about not wanting to see lots of merge commit messages? Or are there other issues?

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  • Installing jdk without sudo?

    - by Legend
    Currently, I have a machine on which I am working in Eclipse, it says that the JRE System Library version is sun-jdk-1.5.0.11 but on my active development machine, it is java-6-sun-1.6.0.16. What is the difference between these two (of course, besides the versioning)? Is there any way I can make the first machine to use the same "java-6-sun-1.6.0.16" version without having sudo permissions on the machine?

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  • Upgrading from VS2008 Pro to VS2010 Pro without MSDN

    - by Richard Bysouth
    Hi I'm looking to upgrade from Visual Studio 2008 Pro to Visual Studio 2010 Pro without MSDN. On the MSDN US site there's pricing for Upgrade from Standard for $299. On the UK MSDN site however, the only options are to buy with MSDN for £484.99. Obviously a big difference in price there! I can't find any info as to what qualifies for the Upgrade from Standard - anyone know about this? Or whether it's available in the UK? thanks Richard

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  • FQL from ASP.NET

    - by superexsl
    Hey, What's the easiest way to perform an FQL query from an ASP.NET application? Do I have to download the Facebook Developer Toolkit (which I only want to use as a last resort), or is there an easier way (maybe through javascript)? I'm not doing any heavy queries if that makes a difference. (I simply want to get the user's profile picture URL from my site. It might not even need FQL?) Thanks for any suggestions

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  • Floats in CSS - Gap/space left on top when floated to the right?

    - by bobthabuilda
    This is a little difficult to describe, but basically there is undesired space left by a floated div on my page. Here are pictures describing the problem. The black boxes are divs. Before floating: After floating: Desired effect: And I'm not sure if it makes a difference, but I also have an empty div with "clear: both" placed immediately after the floated div. How can I achieve this?

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  • what is Entity Framework with POCO

    - by pdiddy
    What is the benefit of using POCO? I don't understand the meaning of Persistence Ignorance, what does this mean? That the poco object can't expose things like Save? I can't wrap my head around this POCO that there's alot of buzz around. What is the difference with the EF generated entities and POCO?

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  • FireBird .net provider 64bit

    - by Lavinski
    I'm trying to get a firebird web application (IIS6 64 bit) to run. However I'm getting bad image format (bit difference incompatability) issues. Has anyone got any advice to get it running. Details AnyCPU application references the .net firebird driver (through nhibernate) which uses a native 64bit dll. There is a native 32bit dll which I use for local development and it works fine. (I havn't got the 32 version working on the 64 bit server either).

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  • Solr PHP client vs file_get_contents?

    - by noname
    I am using PHP to access Solr and I wonder one thing. Why should I use Solr PHP client when I can use: $serializedResult = file_get_contents( 'http://localhost:8983/solr/select?q=niklas&wt=phps'); to get the result in arrays and then print them out? I don't really get the difference. Are there any richer features with the PHP client?

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  • Why is numpy's einsum faster than numpy's built in functions?

    - by Ophion
    Lets start with three arrays of dtype=np.double. Timings are performed on a intel CPU using numpy 1.7.1 compiled with icc and linked to intel's mkl. A AMD cpu with numpy 1.6.1 compiled with gcc without mkl was also used to verify the timings. Please note the timings scale nearly linearly with system size and are not due to the small overhead incurred in the numpy functions if statements these difference will show up in microseconds not milliseconds: arr_1D=np.arange(500,dtype=np.double) large_arr_1D=np.arange(100000,dtype=np.double) arr_2D=np.arange(500**2,dtype=np.double).reshape(500,500) arr_3D=np.arange(500**3,dtype=np.double).reshape(500,500,500) First lets look at the np.sum function: np.all(np.sum(arr_3D)==np.einsum('ijk->',arr_3D)) True %timeit np.sum(arr_3D) 10 loops, best of 3: 142 ms per loop %timeit np.einsum('ijk->', arr_3D) 10 loops, best of 3: 70.2 ms per loop Powers: np.allclose(arr_3D*arr_3D*arr_3D,np.einsum('ijk,ijk,ijk->ijk',arr_3D,arr_3D,arr_3D)) True %timeit arr_3D*arr_3D*arr_3D 1 loops, best of 3: 1.32 s per loop %timeit np.einsum('ijk,ijk,ijk->ijk', arr_3D, arr_3D, arr_3D) 1 loops, best of 3: 694 ms per loop Outer product: np.all(np.outer(arr_1D,arr_1D)==np.einsum('i,k->ik',arr_1D,arr_1D)) True %timeit np.outer(arr_1D, arr_1D) 1000 loops, best of 3: 411 us per loop %timeit np.einsum('i,k->ik', arr_1D, arr_1D) 1000 loops, best of 3: 245 us per loop All of the above are twice as fast with np.einsum. These should be apples to apples comparisons as everything is specifically of dtype=np.double. I would expect the speed up in an operation like this: np.allclose(np.sum(arr_2D*arr_3D),np.einsum('ij,oij->',arr_2D,arr_3D)) True %timeit np.sum(arr_2D*arr_3D) 1 loops, best of 3: 813 ms per loop %timeit np.einsum('ij,oij->', arr_2D, arr_3D) 10 loops, best of 3: 85.1 ms per loop Einsum seems to be at least twice as fast for np.inner, np.outer, np.kron, and np.sum regardless of axes selection. The primary exception being np.dot as it calls DGEMM from a BLAS library. So why is np.einsum faster that other numpy functions that are equivalent? The DGEMM case for completeness: np.allclose(np.dot(arr_2D,arr_2D),np.einsum('ij,jk',arr_2D,arr_2D)) True %timeit np.einsum('ij,jk',arr_2D,arr_2D) 10 loops, best of 3: 56.1 ms per loop %timeit np.dot(arr_2D,arr_2D) 100 loops, best of 3: 5.17 ms per loop The leading theory is from @sebergs comment that np.einsum can make use of SSE2, but numpy's ufuncs will not until numpy 1.8 (see the change log). I believe this is the correct answer, but have not been able to confirm it. Some limited proof can be found by changing the dtype of input array and observing speed difference and the fact that not everyone observes the same trends in timings.

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  • Performance for myCollection.Add() vs. myCollection["key"]

    - by Atomiton
    When dealing with a collection of key/value pairs is there any difference between using its Add() method and directly assigning it? For example, a HtmlGenericControl will have an Attributes Collection: var anchor = new HtmlGenericControl("a"); // These both work: anchor.Attributes.Add("class", "xyz"); anchor.Attributes["class"] = "xyz"; Is it purely a matter of preference, or is there a reason for doing one or the other?

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  • Git commit -a question

    - by ben
    What is the difference between: git commit -m "added a new page" and git commit -a -m "added a new page" I know that the -a option will stage files that have been modified and deleted, but then what does running it without the -a mean? Thanks for reading.

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  • How can I execute pl/pgsql code without creating a function?

    - by Jeremiah Peschka
    With SQL Server, I can execute code ad hoc T-SQL code with full procedural logic through SQL Server Management Studio, or any other client. I've begun working with PostgreSQL and have run into a bit of a difference in that PGSQL requires any logic to be embedded in a function. Is there a way to execute PL/PGSQL code without creating an executing a function?

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  • Bang Notation and Dot Notation in VBA and MS-Access

    - by Nitrodist
    While perusing an application that I'm documenting, I've run across some examples of bang notation in accessing object properties/methods, etc. and in other places they use dot notation for what seems like the same purpose. Is there a difference or preference to using one or the other? Some simple googling only reveals limited information on the subject with some people actually using it in opposite cases. Perhaps there is a coding standards section from MS somewhere that indicates the method of madness?

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  • Writing an OS kernel in assembly with NASM

    - by Betamoo
    I want to know what is the standard way for writing a -simple- kernel to be compiled on NASM? To get it clearer: I was able to define the code block with all the following ways: [segment code] [segment .code] segment code segment .code [section code] [section .code] section code section .code I need to know what is the standard way to do that, And what is the difference between them... Thanks

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  • Django database caching

    - by hekevintran
    The object user has a foreign key relationship to address. Is there a difference between samples 1 and 2? Does sample 1 run the query multiple times? Or is the address object cached? # Sample 1 country = user.address.country city = user.address.city state = user.address.state # Sample 2 address = user.address country = address.country city = address.city state = address.state

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  • C# RSA Cryptographic Algorithm

    - by karthik
    Hi, Is C# 'RSACryptoServiceProvider' cryptographic algorithm is a part of Microsoft- CryptoAPI? Any advantage we have for normal asymmetric encryption by using CryptoAPI over 'RSACryptoServiceProvider' in .Net? I cannot understand the difference between them?And which one is best and safty? Could you please help? Thanks Karthik

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