... Short answer The device pixel ratio is the ratio between physical pixels and logical pixels. For instance, the iPhone 4 and iPhone 4S report a device pixel ratio of 2, because the physical linear resolution is double the logical linear resolution. Physical resolution: 960 x 640 Logical resolutio...

...rchar, so no difference, see documentation :) The notations varchar(n) and char(n) are aliases for character varying(n) and character(n), respectively. character without length specifier is equivalent to character(1). If character varying is used without length specifier, the type ac...

I would like to start using compass and sass to speed up development. At the moment, I have installed Sass on a mac and instructed it to watch scss file for input, and a css file for generated output. ...

... The most readable way is x = 10 if a > b else 11 but you can use and and or, too: x = a > b and 10 or 11 The "Zen of Python" says that "readability counts", though, so go for the first way. Also, the and-or trick will fail if you put a variable instead of 10 and it evaluates to Fals...

I would like to limit the X and Y axis in matplotlib but for a speific subplot. As I can see subplot figure itself doesn't have any axis property. I want for example to change only the limits for the second plot! ...

mongodb, replicates and error: { “$err” : “not master and slaveOk=false”, “code” : 13435出现这个错误的原因是在从库上执行命令导致，默认情况下只有主库可以执行命令。当然可以通过设置使得从库也能执行命令，具体参见：http: s 出现...

...yourself is a testament to that fact. Rather, it is an incredibly bad idea and so we don't allow it, so as to protect you from making this mistake. call to Monitor.Exit within ExitDisposable.Dispose seems to block indefinitely (most of the time) causing deadlocks as other threads attempt to acqu...

... Virtual methods have an implementation and provide the derived classes with the option of overriding it. Abstract methods do not provide an implementation and force the derived classes to override the method. So, abstract methods have no actual code in them, and...

...y question is: would clients see a visible speed improvement in page loads and such if I were to minify my PHP? 7 Answers ...

I've looked at numerous other questions and found very simple answers, including the code below. I simply want to detect when someone changes the content of a text box but for some reason it's not working... I get no console errors. When I set a breakpoint in the browser at the change() functio...