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grep using a character vector with multiple patterns
...or bracket. First backslash is an escape character to interpret the second one needed to disable the operator.
– mbh86
Mar 11 '16 at 14:48
3
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ImportError: No module named matplotlib.pyplot
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You have two pythons installed on your machine, one is the standard python that comes with Mac OSX and the second is the one you installed with ports (this is the one that has matplotlib installed in its library, the one that comes with macosx does not).
/usr/bin/python
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How to use a link to call JavaScript?
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I'd recommend the second one, as the first one scrolls you to the top of the page.
– Matt Grande
Mar 27 '09 at 1:39
7
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HTTP redirect: 301 (permanent) vs. 302 (temporary)
...e history in the back button for example, to avoid going back to the wrong one in a 301? Silently altering a bookmark upon 301 if you click in an old one?
– Xavi Montero
Sep 17 '14 at 10:26
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Interface vs Abstract Class (general OO)
I have had recently two telephone interviews where I've been asked about the differences between an Interface and an Abstract class. I have explained every aspect of them I could think of, but it seems they are waiting for me to mention something specific, and I don't know what it is.
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Is JavaScript an untyped language?
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So the problem is that there's a few different definitions of untyped.
One definition has been talked about in one of the above answers - the runtime doesn't tag values and just treats each value as bits. JavaScript does tag values and has different behaviour based on those tags. So JavaScript o...
Remove all the elements that occur in one list from another
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One way is to use sets:
>>> set([1,2,6,8]) - set([2,3,5,8])
set([1, 6])
Note, however, that sets do not preserve the order of elements, and cause any duplicated elements to be removed. The elements also need to be h...
How to reset postgres' primary key sequence when it falls out of sync?
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@Valery: But in order to avoid gaps mentioned by @mikl two comments above, you need SELECT setval('your_table_id_seq', coalesce((select max(id)+1 from your_table), 1), false);
– Antony Hatchkins
Nov 9 '12 at 12:19
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Why have header files and .cpp files? [closed]
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C++ compilation
A compilation in C++ is done in 2 major phases:
The first is the compilation of "source" text files into binary "object" files: The CPP file is the compiled file and is compiled without any knowledge about the other CPP files (or even libraries), u...
Unix command-line JSON parser? [closed]
Can anyone recommend a Unix (choose your flavor) JSON parser that could be used to introspect values from a JSON response in a pipeline?
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