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Getting the error “Missing $ inserted” in LaTeX

... mode (which is delimited by $ characters). Try escaping them; e.g. update\_element instead of update_element. However, if you're trying to display code, a better solution would be to use the \verb command, which will typeset the text in a monospaced font and will automatically handle underscores a...
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Append class if condition is true in Haml

... I've put this in my helper file, but my app tells me, that there is no "post" variable. – Simon Perepelitsa Aug 10 '10 at 22:16 2 ...
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How to dynamically create CSS class in JavaScript and apply?

...L = '.cssClass { color: #F00; }'; document.getElementsByTagName('head')[0].appendChild(style); document.getElementById('someElementId').className = 'cssClass'; share | improve this answer ...
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Can't subtract offset-naive and offset-aware datetimes

...ms to be the only way to do it. Seems pretty lame that python's got such crappy support for timezones that it needs a third-party module to work with timestamps properly.. – Ian Apr 28 '09 at 4:24 ...
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What is the 
 character?

...eading zero &#xA) There is a good converter at https://r12a.github.io/apps/conversion/ . share | improve this answer | follow | ...
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What is this weird colon-member (“ : ”) syntax in the constructor?

...ring("Name")). It fits in with the constructor better than Foo(int num) : m_Count = 5. Not to mention that classes must be constructed at this point anyway, since it's initialized here. Foo(int num) : Bar = num, wouldn't compile right. It just seems weird seeing Foo(int num) : m_Count(num), since pr...
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Python, Unicode, and the Windows console

...icode API as the win-unicode-console package mentioned below. print(unicode_string) should just work now. I get a UnicodeEncodeError: 'charmap' codec can't encode character... error. The error means that Unicode characters that you are trying to print can't be represented using the current...
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How to access route, post, get etc. parameters in Zend Framework 2

...;getParam('name', 'default'); NOTE: You could have used the superglobals $_GET, $_POST etc., but that is discouraged. share | improve this answer | follow | ...
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How does “cat

...rmat to provide a string into stdin. See https://en.wikipedia.org/wiki/Here_document#Unix_shells for more details. From man bash: Here Documents This type of redirection instructs the shell to read input from the current source until a line containing only word (with no trailing bl...
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Node.js quick file server (static files over HTTP)

..., like this: http-server D:\Folder Check it out: https://github.com/nodeapps/http-server share | improve this answer | follow | ...