大约有 48,000 项符合查询结果（耗时：0.0724秒） [XML]
How to convert a boolean array to an int array
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176
Numpy arrays have an astype method. Just do y.astype(int).
Note that it might not even be ne...
SQL RANK() versus ROW_NUMBER()
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ROW_NUMBER : Returns a unique number for each row starting with 1. For rows that have duplicate values,numbers are arbitarily assigned.
Rank : Assigns a unique number for each row starting with 1,except for rows that have duplicate values,in which case the same ranking is assigned and a ...
Piping both stdout and stderr in bash?
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172
(Note that &>>file appends to a file while &> would redirect and overwrite a ...
Python argparse mutual exclusive group
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106
add_mutually_exclusive_group doesn't make an entire group mutually exclusive. It makes options...
How to quit scala 2.11.0 REPL?
In the last version of scala (2.10.3) REPL, I can type exit to quit from REPL. However, in Scala 2.11.0 this doesn't work.
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mysql :: insert into table, data from another table?
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answered Nov 22 '10 at 2:04
zerkmszerkms
222k5454 gold badges390390 silver badges478478 bronze badges
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Is there a better way to iterate over two lists, getting one element from each list for each iterati
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answered Dec 17 '09 at 2:03
Roberto BonvalletRoberto Bonvallet
25.9k55 gold badges3737 silver badges5555 bronze badges
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PHP Foreach Pass by Reference: Last Element Duplicating? (Bug?)
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170
After the first foreach loop, $item is still a reference to some value which is also being use...
Timeout command on Mac OS X?
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130
You can use
brew install coreutils
And then whenever you need timeout, use
gtimeout
..i...
How to override trait function and call it from the overridden function?
...one was almost there:
trait A {
function calc($v) {
return $v+1;
}
}
class MyClass {
use A {
calc as protected traitcalc;
}
function calc($v) {
$v++;
return $this->traitcalc($v);
}
}
The trait is not a class. You can't access its member...