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What does .SD stand for in data.table in R
.SD looks useful but I do not really know what I am doing with it. What does it stand for? Why is there a preceding period (full stop). What is happening when I use it?
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Does const mean thread-safe in C++11?
I hear that const means thread-safe in C++11 . Is that true?
1 Answer
1
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Append TimeStamp to a File Name
I have come across this problem several times in which I would like to have multiple versions of the same file in the same directory. The way I have been doing it using C# is by adding a time stamp to the file name with something like this DateTime.Now.ToString().Replace('/', '-').Replace(':', '.')...
Curly braces in string in PHP
What is the meaning of { } (curly braces) in string literals in PHP?
5 Answers
5
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What is RSS and VSZ in Linux memory management
What are RSS and VSZ in Linux memory management? In a multithreaded environment how can both of these can be managed and tracked?
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Running a cron job on Linux every six hours
How can I run command every six hours every day?
7 Answers
7
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How can I get every nth item from a List?
I'm using .NET 3.5 and would like to be able to obtain every * n *th item from a List. I'm not bothered as to whether it's achieved using a lambda expression or LINQ.
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How to detect the end of loading of UITableView
I want to change the offset of the table when the load is finished and that offset depends on the number of cells loaded on the table.
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find -exec cmd {} + vs | xargs
Which one is more efficient over a very large set of files and should be used?
3 Answers
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Bash command to sum a column of numbers [duplicate]
I want a bash command that I can pipe into that will sum a column of numbers. I just want a quick one liner that will do something essentially like this:
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