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Output array to CSV in Ruby
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@David it's the file mode. "w" means write to a file. If you don't specify this, it'll default to "rb" (read-only binary mode) and you would get an error when trying to add to your csv file. See ruby-doc.org/core-1.9.3/IO.html fo...
Which timestamp type should I choose in a PostgreSQL database?
...dvice to use TIMESTAMP WITH TIME ZONE for lightweight applications. That said, let me explain some background aspects of this this Option 4 in more detail.
Like Option 3, the reason for the WITH TIME ZONE is because the time at which something happened is an absolute moment in time. WITHOUT TIME ZO...
Why does GCC generate such radically different assembly for nearly the same C code?
...y as the original fast_trunc_one(). I'll spare you the assembly, but it is identical - register names and all.
Step 2: Mathematical reduction: x + (y ^ x) = y
sign can only take one of two values, 0 or 0x80000000.
When x = 0, then x + (y ^ x) = y then trivial holds.
Adding and xoring by 0x80000000...
Does anyone beside me just NOT get ASP.NET MVC? [closed]
I've been fiddling with ASP.NET MVC since the CTP, and I like a lot of things they did, but there are things I just don't get.
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Multiple working directories with Git?
... branch is checked out by current working tree, deleting the
branch is forbidden.
However when the branch is checked out only by other working trees, deleting incorrectly succeeds.
Use find_shared_symref() to check if the branch is in use, not just
comparing with the current working tree's HEAD.
S...
Why is transposing a matrix of 512x512 much slower than transposing a matrix of 513x513?
...rmula:
set = ( address / lineSize ) % numberOfsets
This sort of formula ideally gives a uniform distribution across the sets, because each memory address is as likely to be read (I said ideally).
It's clear that overlaps can occur. In case of a cache miss, the memory is read in the cache and the...
MQTT与TCP的区别 - 创客硬件开发 - 清泛IT社区，为创新赋能！
...IoT概念也是在1999年，因此MQTT协议生逢其时。当时MIT Auto-ID Labs的Kevin Ashton为了把宝洁的供应链上的RFID标签和互联网连接起来，在1999年第一个提出了IoT这个概念。发明人TCP协议的发明人是Vinton Cerf（下图左，曾在IBM工作过两年）...
What is the explanation for these bizarre JavaScript behaviours mentioned in the 'Wat' talk for Code
...ray) to a primitive returns its default value, which for objects with a valid toString() method is the result of calling object.toString() (§8.12.8). For arrays this is the same as calling array.join() (§15.4.4.2). Joining an empty array results in an empty string, so step #7 of the addition opera...
Transitioning from Windows Forms to WPF
...erms of UI components, not data objects. In addition, binding in WinForms didn't always exist in the state it does now, so many developers that grew up with WinForms, or who are used to other technologies that don't use bindings, will often not identify this key difference when switching to a bound ...
How to center a checkbox in a table cell?
The cell contains nothing but a checkbox. It is rather wide because of text in the table header row. How do I center the checkbox (with inline CSS in my HTML? (I know))
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