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numpy: most efficient frequency counts for unique values in an array
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@YohanObadia - depending on the size f the array, first converting it to a series has made the final operation faster for me. I would guess at the mark of around 50,000 values.
– n1k31t4
Oct 30 '18 at 11:50
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Copy constructor for a class with unique_ptr
... unique_ptr can not be shared, you need to either deep-copy its content or convert the unique_ptr to a shared_ptr.
class A
{
std::unique_ptr< int > up_;
public:
A( int i ) : up_( new int( i ) ) {}
A( const A& a ) : up_( new int( *a.up_ ) ) {}
};
int main()
{
A a( 42 );
A ...
android get real path by Uri.getPath()
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Sorry and If I want to convert this image to file , without getting the real path how to do it ?
– Chlebta
Nov 24 '14 at 10:44
9...
Shell command to sum integers, one per line?
...Paste typically merges lines of multiple files, but it can also be used to convert individual lines of a file into a single line. The delimiter flag allows you to pass a x+x type equation to bc.
paste -s -d+ infile | bc
Alternatively, when piping from stdin,
<commands> | paste -s -d+ - | ...
Never seen before C++ for loop
I was converting a C++ algorithm to C#.
I came across this for loop:
12 Answers
12
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How to force JS to do math instead of putting two strings together
...be a string because the contents of txt is not restricted to a number.
to convert it to an int change the line to:
dots = parseInt(document.getElementById("txt").value, 10);
Note: The 10 here specifies decimal (base-10). Without this some browsers may not interpret the string correctly. See MDN:...
How to get the number of characters in a std::string?
...ng length
std::cout << strlen(str.c_str()) << std::endl; // convert C++ string to C-string then call strlen
return 0;
}
Output:
6
6
6
6
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What is the Scala identifier “implicitly”?
...ontain a member selection that is applicable to args (even after trying to convert args with Implicit Views). In this case, the compiler looks for implicit members, locally defined in the current or enclosing scopes, inherited, or imported, that are either Functions from the type of that the.prefix ...
Generate an integer that is not among four billion given ones
...lize hardware-supported vector instructions. I think gcc can automatically convert code to using vector operations in some cases though.
– Brian Gordon
Aug 23 '11 at 15:57
3
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How to round an average to 2 decimal places in PostgreSQL?
...ording to Bryan's response you can do this to limit decimals in a query. I convert from km/h to m/s and display it in dygraphs but when I did it in dygraphs it looked weird. Looks fine when doing the calculation in the query instead. This is on postgresql 9.5.1.
select date,(wind_speed/3.6)::numeri...