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Test whether a list contains a specific value in Clojure
...ains?... supposedly one of the top five FAQs re: Clojure.
It does not check whether a collection contains a value; it checks whether an item could be retrieved with get or, in other words, whether a collection contains a key. This makes sense for sets (which can be thought of as making no distincti...
What are all the common undefined behaviours that a C++ programmer should know about? [closed]
What are all the common undefined behaviours that a C++ programmer should know about?
11 Answers
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'POCO' definition
...her answers have stated, it is technically "Plain Old CLR Object" but I, like David Arno comments, prefer "Plain Old Class Object" to avoid ties to specific languages or technologies.
TO CLARIFY: In other words, they don’t derive from
some special base class, nor do they return any special type...
Copy object values in Visual Studio debug mode
...'s possible to hover over variables to show their value and then right-click to "Copy", "Copy Expression" or "Copy Value".
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How to print last two columns using awk
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You can make use of variable NF which is set to the total number of fields in the input record:
awk '{print $(NF-1),"\t",$NF}' file
this assumes that you have at least 2 fields.
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Remove NA values from a vector
...cluding sum(), mean(), etc.)
Setting na.rm=TRUE does just what you're asking for:
d <- c(1, 100, NA, 10)
max(d, na.rm=TRUE)
If you do want to remove all of the NAs, use this idiom instead:
d <- d[!is.na(d)]
A final note: Other functions (e.g. table(), lm(), and sort()) have NA-related...
Programmatically trigger “select file” dialog box
...Is it possible to trigger its select file dialog box from a button's click event?
13 Answers
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How to compute the sum and average of elements in an array?
...d Apr 28 '12 at 1:54
Marcus RecckMarcus Recck
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Use of #pragma in C
...m-specific, i.e. it tells the compiler to do something, set some option, take some action, override some default, etc. that may or may not apply to all machines and operating systems.
See msdn for more info.
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Ubuntu, vim, and the solarized color palette
I'd really like to get in on all the colorful goodness of the solarized colorscheme , but I can't seem to get it configured just right.
I have the main solarized file in my .vim/colors folder, I've set my terminal profile colors to what is listed on the site, and I've added the lines
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