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Counting the number of elements with the values of x in a vector

... Don't forget about potential floating point issues, especially with table, which coerces numbers to strings. – hadley Dec 17 '09 at 18:10 4 ...
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SQL - The conversion of a varchar data type to a datetime data type resulted in an out-of-range valu

...s with the time zone setting. Specify in other formats like mm/dd/yyyy (usually works). Specifying the date as 30/12/2013 resulted in the error for me. However, specifying it as mm/dd/yyyy format worked. If you need to convert your input the you can try looking into the CONVERT method. Syntax i...
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What is the difference between a pseudo-class and a pseudo-element in CSS?

...nsists of a "colon" (:) followed by the name of the pseudo-class and optionally by a value between parentheses. Pseudo-classes are allowed in all sequences of simple selectors contained in a selector. Pseudo-classes are allowed anywhere in sequences of simple selectors, after the leading type s...
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Cannot set some HTTP headers when using System.Net.WebRequest

...ht to the last section of the answer. If you want to know better, read it all, and i hope you'll enjoy... I countered this problem too today, and what i discovered today is that: the above answers are true, as: 1.1 it's telling you that the header you are trying to add already exist and you s...
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GetHashCode Guidelines in C#

...ot GetHashCode right at every implementation. Second, value types are generally immutable with every value being a new instance rather than a modification of an existing instance. – Jeff Yates Jan 20 '09 at 18:46 ...
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What are the use-cases for Web Workers? [closed]

...lst you’re using the app. From Mozilla: One way workers are useful is to allow your code to perform processor-intensive calculations without blocking the user interface thread. As a practical example, think of an app which has a large table of #s (this is real world, BTW - taken from an app I pr...
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What is the difference between a URI, a URL and a URN?

...tion"). The term "Uniform Resource Name" (URN) has been used historically to refer to both URIs under the "urn" scheme [RFC2141], which are required to remain globally unique and persistent even when the resource ceases to exist or becomes unavailable, and to any other URI with ...
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What's the difference between a proxy server and a reverse proxy server? [closed]

...ccurate, but perhaps too terse. I will try to add some examples. First of all, the word "proxy" describes someone or something acting on behalf of someone else. In the computer realm, we are talking about one server acting on the behalf of another computer. For the purposes of accessibility, I wi...
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Removing “NUL” characters

...ty102.blogspot.ru/2010/04/findreplace-of-nul-objects-in-notepad.html Basically you need to replace \x00 characters with regular expressions share | improve this answer | fol...
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How to wait in bash for several subprocesses to finish and return exit code !=0 when any subprocess

... wait also (optionally) takes the PID of the process to wait for, and with $! you get the PID of the last command launched in background. Modify the loop to store the PID of each spawned sub-process into an array, and then loop again waiting o...