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Remove all special characters from a string in R?
...ular expressions to identify the unwanted characters. For the most easily readable code, you want the str_replace_all from the stringr package, though gsub from base R works just as well.
The exact regular expression depends upon what you are trying to do. You could just remove those specific cha...
Techniques for Tracing Constraints
... could try GHC's debugging flags, in particular, -ddump-tc-trace, and then read through the resulting log to see where Internal (a -> b) ~ t and (Internal a -> Internal a) ~ t are added to the Wanted set, but that will be quite a long read.
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Difference between char* and const char*?
...it could result in Undefined Behavior.
String literals may be allocated in read only memory regions (implementation defined) and an user program should not modify it in anyway. Any attempt to do so results in Undefined Behavior.
So the only difference in that case (of usage with string literal...
What are bitwise shift (bit-shift) operators and how do they work?
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@Mahn, you're reading it backwards from my intent. Substitute Y for X means to replace X with Y. Y is the substitute for X. So the shift is the substitute for the multiplication.
– Derek Park
Jan 2...
Compile time string hashing
I have read in few different places that using C++11's new string literals it might be possible to compute a string's hash at compile time. However, no one seems to be ready to come out and say that it will be possible or how it would be done.
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Best way to store password in database [closed]
...le this is not horrible, it is best to add unique salts to every password. Read this for more.
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CSS Selector for
... <span style="font-weight: bold; color: blue;">
</p>
Further reading:
Browser CSS compatibility on quirksmode.com
I'm surprised that everyone else thinks it can't be done. CSS attribute selectors have been here for some time already. I guess it's time we clean up our .css files.
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What is the entry point of swift code execution?
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You may want to read Files and Initialization
The exception is a special file named “main.swift”, which behaves much
like a playground file, but is built with your app’s source code. The
“main.swift” file can contain top-le...
How to delete the top 1000 rows from a table using Sql Server 2008?
...e wondering why you can't do DELETE TOP (1000) FROM table ORDER BY column, read this: "The rows referenced in the TOP expression used with INSERT, UPDATE, MERGE, or DELETE are not arranged in any order."
– Nick Chammas
Jan 21 '12 at 21:06
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What scalability problems have you encountered using a NoSQL data store? [closed]
... too much for the small server which hosted the traceback logger (it was already an old server, which was only used for development purposes).
At this time CouchDB was rather popular, and so I decided to try it out and write a small traceback-logger with it. The new logger only consisted of a singl...