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How do you tell someone they're writing bad code? [closed]

I've been working with a small group of people on a coding project for fun. It's an organized and fairly cohesive group. The people I work with all have various skill sets related to programming, but some of them use older or outright wrong methods, such as excessive global variables, poor naming ...
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Where can I learn how to write C code to speed up slow R functions? [closed]

What's the best resource for learning how to write C code for use with R? I know about the system and foreign language interfaces section of R extensions, but I find it pretty hard going. What are good resources (both online and offline) for writing C code for use with R? ...
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MySQL maximum memory usage

...is possible to set an upper limit on the amount of memory MySQL uses on a Linux server. 6 Answers ...
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Import PEM into Java Key Store

I am trying to connect to an SSL server which requires me to authenticate myself. In order to use SSL over Apache MINA I need a suitable JKS file. However, I have only been given a .PEM file. ...
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Set environment variables on Mac OS X Lion

...o why there seem to be so many different ones (why? Do they do different things?) 16 Answers ...
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How can I exclude directories from grep -R?

... SOLUTION 1 (combine find and grep) The purpose of this solution is not to deal with grep performance but to show a portable solution : should also work with busybox or GNU version older than 2.5. Use find, for excluding directories foo and b...
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Why java.lang.Object is not abstract? [duplicate]

Why is the Object class, which is base class of 'em all in Java, not abstract? 14 Answers ...
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How to save a PNG image server-side, from a base64 data string

I'm using Nihilogic's "Canvas2Image" JavaScript tool to convert canvas drawings to PNG images. What I need now is to turn those base64 strings that this tool generates, into actual PNG files on the server, using PHP. ...
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Best Practice for Exception Handling in a Windows Forms Application?

I'm currently in the process of writing my first Windows Forms application. I've read a few C# books now so I've got a relatively good understanding of what language features C# has to deal with exceptions. They're all quite theoretical however so what I haven't got yet is a feel for how to translat...
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Image fingerprint to compare similarity of many images

I need to create fingerprints of many images (about 100.000 existing, 1000 new per day, RGB, JPEG, max size 800x800) to compare every image to every other image very fast. I can't use binary compare methods because also images which are nearly similar should be recognized. ...