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Why am I getting “undefined reference to sqrt” error even though I include math.h header? [duplicate

...clude the mathematical functions while linking. It has also been separated from libc onto a separate library libm. To link with these functions you have to advise the linker to include the library -l linker option followed by the library name m thus -lm. ...
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How to create user for a db in postgresql? [closed]

...ve installed PostgreSQL 8.4 on my CentOS server and connected to root user from shell and accessing the PostgreSQL shell. 2...
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Rename a table in MySQL

...u need the back tick ` and not the single quote ' I did the single quote from habit, and got the error, but maybe this will save someone else 10 seconds – Paul Feb 3 '14 at 18:05 ...
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jQuery - replace all instances of a character in a string [duplicate]

... You would create a RegExp object from a string: str = str.replace(new RegExp('"_0x69b9[' + i + ']"', 'g'), _array[i]);. However, consider if you instead can use (\d+) in the pattern to match any number and catch it for lookup in a replacement function, that...
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What is the inverse function of zip in python? [duplicate]

I've used the zip() function from the numpy library to sort tuples and now I have a list containing all the tuples. I had since modified that list and now I would like to restore the tuples so I can use my data. How can I do this? ...
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How to handle $resource service errors in AngularJS

...quests to my API and I am using AngularJS $resource module. It's different from $http so I don't know how to handle my errors. ...
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Netflow record can't get octets (jnca)

... Retrieving Network Usage Information from NetFlow Version 9 Records Netflow is a feature that was introduced on Cisco routers that give the ability to collect IP network traffic as it enters or exits an interface. By analyzing the data that is provided by Netfl...
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MFC日历控件完全自绘MyCalendar Control - 源码下载 - 清泛网 - 专注C/C++及内核技术

... calendars and Gregorian representation of this calculation. Covers period from year 1582 (when Gregorian calendar was established) to year 4099. Background This is a clone of the MFC CDateTimeCtrl with some advantages. Using the code To use the source provided, one must include the header files...
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How to change the timeout on a .NET WebClient object

... A little easier to set the Timeout with a Timespan TimeSpan.FromSeconds(20).Milliseconds ... great solution though! – webwires Mar 6 '14 at 19:26 19 ...
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count (non-blank) lines-of-code in bash

... Just habit. I read pipelines from left to right, which means I usually start with cat, then action, action, action, etc. Clearly, the end result is the same. – Michael Cramer Sep 24 '08 at 14:06 ...