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Is there a performance impact when calling ToList()?
...nsion method Enumerable.ToList() will construct a new List<T> object from the IEnumerable<T> source collection which of course has a performance impact.
However, understanding List<T> may help you determine if the performance impact is significant.
List<T> uses an array (T[...
Do unix timestamps change across timezones?
...tamp itself is not UTC, the timestamp is a number of (milli)seconds passed from a reference point in time. The reference point for the Unix timestamp (the Unix epoch) is the one that's UTC: 00:00:00 UTC 1970.01.01
– Sandman
Apr 19 '14 at 19:44
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Update MongoDB field using value of another field
In MongoDB, is it possible to update the value of a field using the value from another field? The equivalent SQL would be something like:
...
Formula px to dp, dp to px android
...olved my problem by using the following formulas. May other people benefit from it.
dp to px:
displayMetrics = context.getResources().getDisplayMetrics();
return (int)((dp * displayMetrics.density) + 0.5);
px to dp:
displayMetrics = context.getResources().getDisplayMetrics();
return (int) ((px/...
how does multiplication differ for NumPy Matrix vs Array classes?
... rules of linear algebra
some code snippets to illustrate:
>>> from numpy import linalg as LA
>>> import numpy as NP
>>> a1 = NP.matrix("4 3 5; 6 7 8; 1 3 13; 7 21 9")
>>> a1
matrix([[ 4, 3, 5],
[ 6, 7, 8],
[ 1, 3, 13],
[ 7, 21, 9...
How can I create an object based on an interface file definition in TypeScript?
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Thanks. I was hoping to get away from having to define all of the modal contents initially. Would it be easier if instead of an interface I defined Modal as a class with properties and then used new and a constructor to set up all of the initial values?
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What's the need of array with zero elements?
...ll remain that of the flexible array member, even if this would differ
from that of the replacement array. If this array would have no elements, it behaves as if
it had one element but the behavior is undefined if any attempt is made to access that
element or to generate a pointer one pas...
How do I write a Firefox Addon? [closed]
...to write. So your best bet is to check the code snippets page (also linked from the MDC Extensions page), then search MDC/google, then ask in the forums.
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How to find out if a file exists in C# / .NET?
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@ADTC: from a security point of view it sounds normal that it works that way, from a developer point of view, it may make things more complicated. Do you get an exception in that case if you try to create a file?
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C++ blogs that you regularly follow? [closed]
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I have learned so much from his Channel 9 videos. +1
– Sabuncu
Dec 3 '10 at 9:17
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