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Mechanisms for tracking DB schema changes [closed]
...cause stuff will go wrong) [mysqldump].
Create bookkeeping table (called _meta) if it doesn't exist.
Read current VERSION from _meta table. Assume 0 if not found.
For all .sql files numbered higher than VERSION, execute them in order
If one of the files produced an error: roll back to the ba...
binning data in python with scipy/numpy
...
bins = numpy.linspace(0, 1, 10)
digitized = numpy.digitize(data, bins)
bin_means = [data[digitized == i].mean() for i in range(1, len(bins))]
An alternative to this is to use numpy.histogram():
bin_means = (numpy.histogram(data, bins, weights=data)[0] /
numpy.histogram(data, bins)[0...
Can not connect to local PostgreSQL
... the permissions on the socket file and its directories /var and /var/pgsql_socket. Your Rails app (OSX user) must have execute (x) permissions on these directories (preferably grant everyone permissions) and the socket should have full permissions (wrx). You can use ls -lAd <file> to check t...
How to modify Github pull request？
...nswered Apr 29 '14 at 18:08
user_19user_19
55177 silver badges1212 bronze badges
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Signed to unsigned conversion in C - is it always safe?
...hort Answer
Your i will be converted to an unsigned integer by adding UINT_MAX + 1, then the addition will be carried out with the unsigned values, resulting in a large result (depending on the values of u and i).
Long Answer
According to the C99 Standard:
6.3.1.8 Usual arithmetic conversions...
How to Convert all strings in List to lower case using LINQ?
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var _reps = new List(); // with variant data
_reps.ConvertAll<string>(new Converter<string,string>(delegate(string str){str = str.ToLower(); return str;})).Contains("invisible"))
...
invalid target release: 1.7
...
You need to set JAVA_HOME to your jdk7 home directory, for example on Microsoft Windows:
"C:\Program Files\Java\jdk1.7.0_40"
or on OS X:
/Library/Java/JavaVirtualMachines/jdk1.7.0_40.jdk/Contents/Home
...
push_back vs emplace_back
I'm a bit confused regarding the difference between push_back and emplace_back .
7 Answers
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pdf2htmlEX实现pdf转html - 开源 & Github - 清泛网 - 专注C/C++及内核技术
...ll', function() {
<span style="white-space:pre"> </span>self.update_page_idx();
<span style="white-space:pre"> </span>self.schedule_render(true);
<span style="white-space:pre"> </span>}, false);
*/
/*新增，使用document对象上滚动加载页面数据，这样可以兼容...
How to change the default GCC compiler in Ubuntu?
...l uses g++-7 standard libraries, and now i'm getting errors with undefined __builtin stuff.
– Youda008
May 1 '19 at 8:17
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