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Numpy: find first index of value fast
...re is a feature request for this scheduled for Numpy 2.0.0: https://github.com/numpy/numpy/issues/2269
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linux svn搭建配置及svn命令详解 - 更多技术 - 清泛网 - 专注C/C++及内核技术
...指定端口号，默认为3690）
1、安装
[root@www ~]# yum install subversion
[root@www ~]# svn -v 判断是否安装成功
svnserve, version 1.6.11 (r934486) 出现类型提示，说明安装成功。
有了SVN软件后还需要建立SVN库。
[root...
How to make connection to Postgres via Node.js
...se.
The interface in node.js that I used can be found here https://github.com/brianc/node-postgres
var pg = require('pg');
var conString = "postgres://YourUserName:YourPassword@localhost:5432/YourDatabase";
var client = new pg.Client(conString);
client.connect();
//queries are queued and execute...
Aggregate function in an SQL update query?
...e doc to get why FROM is considered by PostgreSQL as a self-join : https://www.postgresql.org/docs/9.5/static/sql-update.html#AEN89239
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Looking for files NOT owned by someone
...en provided:
$ find / -nouser
You can use it like so:
$ sudo find /var/www -nouser -exec chown root:apache {} \;
And a related one:
$ find / -nogroup
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How to filter SQL results in a has-many-through relation
Assuming I have the tables student , club , and student_club :
13 Answers
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Rails auto-assigning id that already exists
...sequence!(t)
end
I found the reset_pk_sequence! from this thread. http://www.ruby-forum.com/topic/64428
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Fastest way to tell if two files have the same contents in Unix/Linux?
...e data or not. I do this a for a lot of files, and in my script the diff command seems to be the performance bottleneck.
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How to determine whether a Pandas Column contains a particular value
I am trying to determine whether there is an entry in a Pandas column that has a particular value. I tried to do this with if x in df['id'] . I thought this was working, except when I fed it a value that I knew was not in the column 43 in df['id'] it still returned True . When I subset to a data...
Wolfram's Rule 34 in XKCD [closed]
...enever a three-bit string matches rule 2's configuration, the center bit becomes (or stays, in this case) true on the next iteration.
A CA's rules are described as a bitstring. Say it's rule 110 (my favorite). In binary, 110 is 01101110. The digit of least significance is zero. This means that if t...