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Closed 10 years ago.
Javascript is nice, but for the better performance, why web browser(ie/chrome,firefox,safari) do not add lua vm? or make lua vm become a part of web browser standard?
Welcome any comment
Because today's JIT compilers for Javascript are just as fast, if not faster than, JIT engines for Lua.
The web experimented with different client-scripting languages in the mid-1990s (when we had LiveScript (an early JavaScript), VBScript (thank you, Microsoft), as well as Tcl. The web decided it didn't like that and we settled on a single language (JavaScript, now EcmaScript).
Lua offers no real advantages and introduces a massive workload (the DOM API would need to be implemented, for example, and Lua has different semantics to EcmaScript (with respect to typing and how functions work, amongst other things) so the majority of web developers would need to relearn their trade.
There just isn't a business case in it.
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Closed 9 years ago.
I want to start a web project in ASP.Net and still not decided which database to use. I have had experience with MSSQL and Oracle, but I want one that is free to the end user.
My options are: MySQL, Firebird and PostgreSQL.
What do you recommend and why?
Thanks for the support.
I've used MySql, PostgreSql, and MS Sql extensively. I would recommend MySql. It is easy to set up and configure, has all the features you will need, and is used by countless open source projects across the world, including Wordpress, which a ridiculous number of people use to power their websites.
I would use PostgreSql if you need more powerful and fine-grained support. It has been around a long time along with it's ancestors, and at one point powered the largest database in the world, a 2 petabyte database run by Yahoo.
For a simple web app, though, I would recommend MySql. It is used by more people, and is the de facto open source database.
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Closed 10 years ago.
I know the basic concept of a WebSocket . I know that it allows simultaneous bidirectional(Full duplex), persistent communication support built into it . So it is very useful for a server push kind of scenarios . What other scenarios are WebSockets best suited for ? What are some of the common situation where we as programmers should actively look at WebSockets as the solution instead of reinventing the wheel ?
Well, server push is the main component of the bidirectional support that the single direction of HTTP is lacking. It also supports cross-domain requests. Because the server can now contact the client asynchronously, it enables a whole bunch of techniques and applications:
Built-in heartbeats. I use this in one of my apps, and I no longer have to check myself if someone disconnects.
Have a client app that is served in real-time by different backend applications
Real-time updates of streaming data, news feeds, etc
Multi-user games that run in the browser
All of these you could somewhat-do before with long-polling, but it was inefficient (tons of overhead), complex (hard to implement) and ugly (not natural to use at all). WebSocket simpilfies much of that. According to this article, WebSocket can typically reduce overhead by 500 times and latency by 3 times. http://www.websocket.org/quantum.html
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Closed 10 years ago.
By asking for the 'relative popularity' of different languages, rather than asking 'what is the best language?' or 'what is your favorite language', I hope to make this somewhat objective.
I want a language for machine learning / matrices, that is:
opensource-friendly (cf matlab)
fast for inner-loops (cf python,matlab)
fast for matrices (most languages are about the same, since they can usually use BLAS)
has terse, easy to read syntax (cf java)
I've currently settled on java, since it's average at everything, but really poor at nothing, but I can't help feeling that java feels more and more dated, eg no operator overloading, and the borked generics, so I'm wondering what the feeling on the relative popularity of different languages for machine learning is?
I think mostly people use C++, matlab and python, but just curious if there's some language that I've missed that everyone's busy using, that I didn't realize yet?
When I worked on a machine learning project with a friend, I picked up R, which is open source, designed for matrix math, and has extensive library support. It's certainly terser than Java, and I found the syntax pleasant, but that's a subjective judgement.
According to Rexer Analytics, R is the most popular data mining tool, being used by almost half of all of their survey respondents.
(Information on R is hard to search for, so they have a Google frontend for searching for information about it.)
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Closed 10 years ago.
How much better would commercial OCR software be compared to the stuff that's available online for free?
More specifically: Reading text in pictures (things like book covers etc...)
I work with OCR quite a lot and can definitely vouch that the commercial offerings are much better than what you can find out there for free. Yes, you can make a free one 'work', but it will take a lot of effort for sub-optimal results.
I recommend finding a product that uses the ABBYY FineReader : It does a great job with little configuration.
You may want to consider whether you need to use an SDK provided by the OCR supplier or an end-user application. The SDK will provide position details, etc of what it finds and offer a lot more in-depth control, but will be more expensive. The end-user package will basically just read everything it finds, but you may be able to set it to automatic or control it rudimentally and it might be good enough for what you're trying to do, and may be a lot cheaper.
Get a trial version and give it a go!
Google's ocropus is free opensource and one of the best
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Closed 10 years ago.
As an amateur mobile developer, I feel dismay every time I have to fix, update or add new features to an application of mine.
I'm eagerly awaiting the moment you can just develop a web application for any kind of device.
HTML5 and new APIs like Geolocation API or Contacts API are a step forward, but what other APIs could be useful to move current mobile developers to the web? For example, some kind of Sensor API to access mobile accelerometers or magnetometers.
I am aware that future Flash and AIR mobile releases are coming, but I'd rather prefer web standards.
There’s an idea to add a general devices API to HTML5.
http://www.w3.org/TR/dap-api-reqs/
To be honest, I don’t think you can do this sort of thing generically (or at least it’s an impractical challenge). I think it’s down to the folks who make mobile operating systems — i.e. Apple, Google, and the rest — decide whether and how to provide JavaScript access to hardware.
It’s potentially a massive security risk. Go to a hijacked website, and suddenly Russian criminals are copying every photo you take? There’s a “powerful mobile web application” for you.