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What's the @ in front of a string in C#?
...ored.
So "C:\\Users\\Rich" is the same as @"C:\Users\Rich"
There is one exception: an escape sequence is needed for the double quote. To escape a double quote, you need to put two double quotes in a row. For instance, @"""" evaluates to ".
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Ruby's ||= (or equals) in JavaScript?
I love Ruby's ||= mechanism. If a variable doesn't exist or is nil , then create it and set it equal to something:
6 Ans...
How is Pythons glob.glob ordered?
... answered Jul 21 '11 at 9:02
XionXion
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What does 'predicate' mean in the context of computer science? [duplicate]
Specifically I've seen it used in the context of text filtering. As if "predicate" == "filter criteria".
7 Answers
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Adding an arbitrary line to a matplotlib plot in ipython notebook
...rough the ipython notebook. I'm trying to add some annotation lines to an existing graph and I can't figure out how to render the lines on a graph. So, for example, if I plot the following:
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Determine the number of NA values in a column
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Thank you for this. To expand this a little bit. In counting amount of arbitrary value, other than NA is writing a boolean function is.value and then using sum(is.value(df$col)) the way to go or is there a more concise direct syntax for this?
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Test if executable exists in Python?
In Python, is there a portable and simple way to test if an executable program exists?
21 Answers
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Why can't C++ be parsed with a LR(1) parser?
...n of C++ parsing, which states that:
"C++ grammar is ambiguous,
context-dependent and potentially
requires infinite lookahead to resolve
some ambiguities".
It goes on to give a number of examples (see page 147 of the pdf).
The example is:
int(x), y, *const z;
meaning
int x;
int y;
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Adding a parameter to the URL with JavaScript
In a web application that makes use of AJAX calls, I need to submit a request but add a parameter to the end of the URL, for example:
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Which is the fastest algorithm to find prime numbers?
... and square free operations, both operations being of about the same complexity and able to be optimized in about the same way.
– GordonBGood
Dec 6 '13 at 3:06
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