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What's the fastest way to merge/join data.frames in R?
...he first. If there are duplicates in the second data frame then the match and merge approaches are not the same. Match is, of course, faster since it is not doing as much. In particular it never looks for duplicate keys. (continued after code)
DF1 = data.frame(a = c(1, 1, 2, 2), b = 1:4)
DF2 = da...
Eclipse error: indirectly referenced from required .class files?
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Universal and simple answer that help me a lot in different case :) THX
– Mariusz Chw
Dec 10 '13 at 15:37
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Any way to modify Jasmine spies based on arguments?
...ent parameters. I'd like to mock this external API out with a Jasmine spy, and return different things based on the parameters. Is there any way to do this in Jasmine? The best I can come up with is a hack using andCallFake:
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Why is exception.printStackTrace() considered bad practice?
...() writes the stack trace to System.err PrintStream. The System.err stream and the underlying standard "error" output stream of the JVM process can be redirected by
invoking System.setErr() which changes the destination pointed to by System.err.
or by redirecting the process' error output stream. ...
How to post pictures to instagram using API
... after a quick search i found that there is no such function in the API :( and it feels weird... because they should provide one. I am not sure if there is any other way (except the apps for android and iOS) to upload picture using php. Kindly give me any sort of idea if there is any possibility.
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How to grant permission to users for a directory using command line in Windows?
...sions to a user on a directory (Read, Write, Modify) using the Windows command line?
17 Answers
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Object-orientation in C
...It tries to keep minimal the available concepts for the sake of simplicity and flexibility: uniform object oriented programming including open classes, metaclasses, property metaclasses, generics, multimethods, delegation, ownership, exceptions, contracts and closures. There is a draft paper (PDF) ...
How do pointer to pointers work in C?
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Let's assume an 8 bit computer with 8 bit addresses (and thus only 256 bytes of memory). This is part of that memory (the numbers at the top are the addresses):
54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69
+----+----+----+----+----+----+----+...
An efficient compression algorithm for short text strings [closed]
...ing, not compression per se (at least not entirely). He uses a static word and letter dictionary.
– Roy Tinker
Oct 27 '10 at 18:46
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How to Create Multiple Where Clause Query Using Laravel Eloquent?
I'm using the Laravel Eloquent query builder and I have a query where I want a WHERE clause on multiple conditions. It works, but it's not elegant.
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