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Eclipse Kepler for OS X Mavericks request Java SE 6
I have just made a clean installation of OS X Mavericks , and I have downloaded Eclipse Kepler , but if I execute it, gives me this message:
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Difference between & and && in Java? [duplicate]
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& is bitwise AND operator comparing bits of each operand.
For example,
int a = 4;
int b = 7;
System.out.println(a & b); // prints 4
//meaning in an 32 bit system
// 00000000 00000000 00000000 00000100
// 00000000 00000000 00000000 00000111
// ===================================
// 0...
How to filter a dictionary according to an arbitrary condition function?
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And here is a good explanation why the function call dict() is slower than the constructor/literal syntax {} doughellmann.com/2012/11/…
– dorvak
Jul 10 '13 at 9:37
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In Python, if I return inside a “with” block, will the file still close?
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Yes, it acts like the finally block after a try block, i.e. it always executes (unless the python process terminates in an unusual way of course).
It is also mentioned in one of the examples of PEP-343 which is the specification for the with statement:
with locked(myLock):
# Code here exec...
ASP.NET MVC 3: Override “name” attribute with TextBoxFor
Is it possible when using Html.TextBoxFor to override the name attribute?
11 Answers
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Make a negative number positive
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Just call Math.abs. For example:
int x = Math.abs(-5);
Which will set x to 5.
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JavaScript: How to pass object by value?
...y may be to set o as the prototype of a new object.
var o = {};
(function(x){
var obj = Object.create( x );
obj.foo = 'foo';
obj.bar = 'bar';
})(o);
alert( o.foo ); // undefined
So any properties you add to obj will be not be added to o. Any properties added to obj with the same prop...
Apply a function to every row of a matrix or a data frame
Suppose I have a n by 2 matrix and a function that takes a 2-vector as one of its arguments. I would like to apply the function to each row of the matrix and get a n-vector. How to do this in R?
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What is your favorite C programming trick? [closed]
For example, I recently came across this in the linux kernel:
37 Answers
37
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Why are Where and Select outperforming just Select?
...t of constructing the new state of the where iterator, which is more complex than the simple iterator that the Select version uses.
As you can see, for a given n, the Select version is a constant, whereas the Where+Select version is a linear equation with p(valid) as a variable. The actual values ...