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GraphViz - How to connect subgraphs?

In the DOT language for GraphViz , I'm trying to represent a dependency diagram. I need to be able to have nodes inside a container and to be able to make nodes and/or containers dependent on other nodes and/or containers. ...
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How to check for valid email address? [duplicate]

Is there a good way to check a form input using regex to make sure it is a proper style email address? Been searching since last night and everybody that has answered peoples questions regarding this topic also seems to have problems with it if it is a subdomained email address. ...
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What is the point of interfaces in PHP?

Interfaces allow you to create code which defines the methods of classes that implement it. You cannot however add any code to those methods. ...
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What is the difference between HTML tags and ?

I would like to ask for some simple examples showing the uses of <div> and <span> . I've seen them both used to mark a section of a page with an id or class , but I'm interested in knowing if there are times when one is preferred over the other. ...
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C++ Exceptions questions on rethrow of original exception

Will the following append() in the catch cause the rethrown exception to see the effect of append() being called? 4 Answers...
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Argparse: Required argument 'y' if 'x' is present

I have a requirement as follows: 5 Answers 5 ...
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Why do C and C++ compilers allow array lengths in function signatures when they're never enforced?

This is what I found during my learning period: 10 Answers 10 ...
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best way to preserve numpy arrays on disk

... am looking for a fast way to preserve large numpy arrays. I want to save them to the disk in a binary format, then read them back into memory relatively fastly. cPickle is not fast enough, unfortunately. ...
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Clean ways to write multiple 'for' loops

For an array with multiple dimensions, we usually need to write a for loop for each of its dimensions. For example: 16 An...
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Moving from CVS to Git: $Id$ equivalent?

I read through a bunch of questions asking about simple source code control tools and Git seemed like a reasonable choice. I have it up and running, and it works well so far. One aspect that I like about CVS is the automatic incrementation of a version number. ...