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Is there a standard sign function (signum, sgn) in C/C++?
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Surprised no one has posted the type-safe C++ version yet:
template <typename T> int sgn(T val) {
return (T(0) < val) - (val < T(0));
}
Benefits:
Actually implements signum (-1, 0, or 1). Implementations here using co...
Using the “animated circle” in an ImageView while loading stuff
I am currently using in my application a listview that need maybe one second to be displayed.
6 Answers
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NumPy or Pandas: Keeping array type as integer while having a NaN value
... value to represent NaN.
You can also temporarily duplicate the columns: one as you have, with floats; the other one experimental, with ints or strings. Then inserts asserts in every reasonable place checking that the two are in sync. After enough testing you can let go of the floats.
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MySQL case insensitive select
Can anyone tell me if a MySQL SELECT query is case sensitive or case insensitive by default? And if not, what query would I have to send so that I can do something like:
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The requested operation cannot be performed on a file with a user-mapped section open
...my bin folder, after stopping the main service, I am getting an error with one file (TexteDll). The error is:
28 Answers
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What is the HTML tabindex attribute?
...able".
In my mind the second thing is even more important than the first one. There are very few elements that are focusable by default (e.g. <a> and form controls). Developers very often add some JavaScript event handlers (like 'onclick') on not focusable elements (<div>, <span>...
How to insert an element after another element in JavaScript without using a library?
...'NewElement';
/* Add NewElement BEFORE -OR- AFTER Using the Aforementioned Prototypes */
NewElement.appendAfter(document.getElementById('Neighbor2'));
div {
text-align: center;
}
#Neighborhood {
color: brown;
}
#NewElement {
color: green;
}
<div id="Neighborhood">
<...
How do I build a numpy array from a generator?
...y(list(gimme()))
can make two identical generators, run through the first one to find the total length, initialize the array, and then run through the generator again to find each element:
length = sum(1 for el in gimme())
my_array = numpy.empty(length)
for i, el in enumerate(gimme()): my_array[i]...
How do I force make/GCC to show me the commands?
... for make, and -x tells sh to print the expanded line before executing it.
One advantage over -n is that is actually runs the commands. I have found that for some projects (e.g. Linux kernel) that -n may stop running much earlier than usual probably because of dependency problems.
One downside of th...
How to get the class of the clicked element?
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One of those funny situations where jQuery is the long way. this.className will give you the same as $(this).attr("class")
– David Gilbertson
Sep 2 '13 at 23:25
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