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Is there a performance impact when calling ToList()?

When using ToList() , is there a performance impact that needs to be considered? 8 Answers ...
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how does multiplication differ for NumPy Matrix vs Array classes?

The numpy docs recommend using array instead of matrix for working with matrices. However, unlike octave (which I was using till recently), * doesn't perform matrix multiplication, you need to use the function matrixmultipy(). I feel this makes the code very unreadable. ...
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vector::at vs. vector::operator[]

I know that at() is slower than [] because of its boundary checking, which is also discussed in similar questions like C++ Vector at/[] operator speed or ::std::vector::at() vs operator[] << surprising results!! 5 to 10 times slower/faster! . I just don't understand what the at() met...
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Why isn't Python very good for functional programming? [closed]

I have always thought that functional programming can be done in Python. Thus, I was surprised that Python didn't get much of a mention in this question, and when it was mentioned, it normally wasn't very positive. However, not many reasons were given for this (lack of pattern matching and algebra...
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PHP “php://input” vs $_POST

... before transmitting them to the server. You can override this behavior by setting processData: false. Just read the $.ajax() documentation, and don't forget to send the correct media type in the Content-Type header. URL encoding? What the heck!!!??? Typically, if you are doing a normal, synchrono...
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vertical-align with Bootstrap 3

...rised no one mentioned this yet but, instead of the comment stuff, you can set "font-size: 0;" on the parent of the inline-block divs to remove the "mystery space" – Poff Jun 4 '15 at 14:26 ...
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How do I parse an ISO 8601-formatted date?

I need to parse RFC 3339 strings like "2008-09-03T20:56:35.450686Z" into Python's datetime type. 27 Answers ...
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How does database indexing work? [closed]

Given that indexing is so important as your data set increases in size, can someone explain how indexing works at a database-agnostic level? ...
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How can I obfuscate (protect) JavaScript? [closed]

I want to make a JavaScript application that's not open source, and thus I wish to learn how to can obfuscate my JS code? Is this possible? ...
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Why should I care about lightweight vs. annotated tags?

I switched from Subversion to Git as my day-to-day VCS last year and am still trying to grasp the finer points of "Git-think". ...