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Fastest Way of Inserting in Entity Framework
...SaveChanges() once after ALL records.
Call SaveChanges() after for example 100 records.
Call SaveChanges() after for example 100 records and dispose the context and create a new one.
Disable change detection
For bulk inserts I am working and experimenting with a pattern like this:
using (Transact...
How to make good reproducible pandas examples
...m.seed so we have the exact same frame): df = pd.DataFrame(np.random.randn(100000000, 10)). Saying that, "make this code fast for me" is not strictly on topic for the site...
write out the outcome you desire (similarly to above)
In [3]: iwantthis
Out[3]:
A B
0 1 5
1 4 6
Explain what the ...
Why does (0 < 5 < 3) return true?
...example, you could increment a counter directly with the result of A > 100, which would increment the counter if A is greater than 100. This technique might be viewed as a quirk or a trick in Java, but in an array or functional language may be idiomatic.
A classic example in the array language...
Check if a user has scrolled to the bottom
... if($(window).scrollTop() + $(window).height() > $(document).height() - 100) {
alert("near bottom!");
}
});
You can test that version here, just adjust that 100 to whatever pixel from the bottom you want to trigger on.
...
How to calculate moving average using NumPy?
...rint('\n'+f.__doc__+ ' : ')
%timeit b=f(a,3)
print('\nLarge window (n=1001)')
for f in functions[0:-2] :
print('\n'+f.__doc__+ ' : ')
%timeit b=f(a,1001)
print('\nMemory\n')
print('Small window (n=3)')
N = 10**7
a = np.random.rand(N)
%load_ext memory_profiler
for f in functions[2:] : ...
How can I apply styles to multiple classes at once?
...te.
You should add another feature.
.abc, .xyz {
margin-left:20px;
width: 100px;
height: 100px;
}
OR
a.abc, a.xyz {
margin-left:20px;
width: 100px;
height: 100px;
}
OR
a {
margin-left:20px;
width: 100px;
height: 100px;
}
...
How to draw a custom UIView that is just a circle - iPhone app
... this --
self.circleView = [[UIView alloc] initWithFrame:CGRectMake(10,20,100,100)];
self.circleView.alpha = 0.5;
self.circleView.layer.cornerRadius = 50; // half the width/height
self.circleView.backgroundColor = [UIColor blueColor];
...
ZeroMQ的学习和研究（PHP代码实例） - C/C++ - 清泛网 - 专注C/C++及内核技术
...ile (true) {
// Get values that will fool the boss
$zipcode = mt_rand(0, 100000);
$temperature = mt_rand(-80, 135);
$relhumidity = mt_rand(10, 60);
// Send message to all subscribers
$update = sprintf ("%05d %d %d", $zipcode, $temperature, $relhumidity);
$publisher->send ($update);
}</pre...
Why does 'continue' behave like 'break' in a Foreach-Object?
... on a particular iteration, thus, it simulates the continue in a loop.
1..100 | ForEach-Object {
if ($_ % 7 -ne 0 ) { return }
Write-Host "$($_) is a multiple of 7"
}
There is a gotcha to be kept in mind when refactoring. Sometimes one wants to convert a foreach statement block into a pip...
Why do we check up to the square root of a prime number to determine if it is prime?
...
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