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Calculating moving average
... of non-NA values. Here's one way of doing that, incorporating the comment from @Ricardo Cruz:
cx <- c(0, cumsum(ifelse(is.na(x), 0, x)))
cn <- c(0, cumsum(ifelse(is.na(x), 0, 1)))
rx <- cx[(n+1):length(cx)] - cx[1:(length(cx) - n)]
rn <- cn[(n+1):length(cx)] - cn[1:(length(cx) - n)]
rs...
Ensure that HttpConfiguration.EnsureInitialized()
... I was getting this answer so I compared my project that was generated from a preview version of VS 2013 to one that was generated with Update 1 and it the difference is that they replaced WebApiConfig.Register(...) with GlobalConfiguration.Configure(...) as gentiane describes in their answer. T...
google oauth2 redirect_uri with several parameters
... @spender: so you imply that two requests almost in sequence from the same client might be handled by different servers in the webfarm. If that's the case, this is not the only thing affected, basically Session variable couldn't be used in that scenario for anything. BTW: I am not argu...
In Java, are enum types inside a class static?
I can't seem to access instance members of the surrounding class from inside an enum, as I could from inside an inner class. Does that mean enums are static? Is there any access to the scope of the surrounding class's instance, or do I have to pass the instance into the enum's method where I need it...
Static Block in Java [duplicate]
...ass is loaded and a good place to put initialization of static variables.
From http://java.sun.com/docs/books/tutorial/java/javaOO/initial.html
A class can have any number of static initialization blocks, and they can appear anywhere in the class body. The runtime system guarantees that static ...
Class JavaLaunchHelper is implemented in both. One of the two will be used. Which one is undefined [
...
From what I've found online, this is a bug introduced in JDK 1.7.0_45. It appears to also be present in JDK 1.7.0_60. A bug report on Oracle's website states that, while there was a fix, it was removed before the JDK was rele...
Declare multiple module.exports in Node.js
... otherMethod,
// anotherMethod
};
Note here:
You can call method from otherMethod and you will need this a lot
You can quickly hide a method as private when you need
This is easier for most IDE's to understand and autocomplete your code ;)
You can also use the same technique for import: ...
Accurate way to measure execution times of php scripts
...
You can use the microtime function for this. From the documentation:
microtime — Return current Unix timestamp with microseconds
If get_as_float is set to TRUE, then microtime() returns a float, which represents the current time in seconds since the Uni...
Why switch is faster than if
...ix: No, refer to this for info: artima.com/underthehood/flowP.html . Quote from article: When the JVM encounters a tableswitch instruction, it can simply check to see if the key is within the range defined by low and high. If not, it takes the default branch offset. If so, it just subtracts low from...
In Python, if I return inside a “with” block, will the file still close?
...haps taunting the snake a bit, but what if I return a generator expression from within the with block, does the guarantee hold for as long as the generator keeps yielding values? for as long as anything references it? I.e. do i need to use del or assign a different value to the variable which holds ...