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Practical uses of different data structures [closed]
...k about data structures, but I can't find a simple list of data structures and their practical use out there. I'm trying to study for an interview and I think this would help me out, along with many others. I'm looking for something like this:
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Omit rows containing specific column of NA
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You could use the complete.cases function and put it into a function thusly:
DF <- data.frame(x = c(1, 2, 3), y = c(0, 10, NA), z=c(NA, 33, 22))
completeFun <- function(data, desiredCols) {
completeVec <- complete.cases(data[, desiredCols])
return(data...
What is the best way to iterate over a dictionary?
...een a few different ways to iterate over a dictionary in C#. Is there a standard way?
30 Answers
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How to determine the Boost version on a system?
...re it out manually (rather than in-code), the go to the include directory, and open up version.hpp. BOOST_VERSION takes a bit of deciphering, but BOOST_LIB_VERSION is pretty clear. The value of mine is currently "1_42"
– T.E.D.
Sep 14 '10 at 12:44
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Difference between String replace() and replaceAll()
What's the difference between java.lang.String 's replace() and replaceAll() methods,
other than later uses regex? For simple substitutions like, replace . with / ,
is there any difference?
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Set up a scheduled job?
I've been working on a web app using Django, and I'm curious if there is a way to schedule a job to run periodically.
24 A...
UIActionSheet cancel button strange behaviour
...I can only activate it by clicking somewhere in the middle of the "Cancel" and "Ok" buttons.
7 Answers
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Creating object with dynamic keys [duplicate]
First off, I'm using Cheerio for some DOM access and parsing with Node.js. Good times.
2 Answers
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MongoDB数据导出导入工具：mongoexport,mongoimport - 大数据 & AI - 清泛...
...sity e.g. -vvvvv)
--version print the program's version and exit
-h [ --host ] arg mongo host to connect to ( <set name>/s1,s2 for sets)
--port arg server port. Can also use --host hostname:port
--ipv6 enable IPv6 support (disable...
undefined reference to boost::system::system_category() when compiling
...do.)
Assuming you use gcc, try adding -lboost_system to your compiler command line in order to link against that library.
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