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Is there a short cut for going back to the beginning of a file by vi editor?
When reading a long file by vi editor, it would be very nice to get back to the beginning of the file by some short cuts when you really need to do so. Even ctrl + B sometimes is too slow. Does anyone know such a tool?
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SQL to find the number of distinct values in a column
...gregate function:
SELECT COUNT(DISTINCT column_name) AS some_alias FROM table_name
This will count only the distinct values for that column.
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Best way to assert for numpy.array equality?
...__eq__ returns a new array (so TestCase.assertEqual fails), what is the best way to assert for equality?
6 Answers
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数据结构、算法复杂度一览表 - 更多技术 - 清泛网移动版 - 专注C/C++及内核技术
...omplexities常用算法、数据结构复杂度一览表。来源：http://bigocheatsheet.com/
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图G(V,E), V为顶...
Principles for Modeling CouchDB Documents
I have a question that I've been trying to answer for some time now but can't figure out:
4 Answers
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Best/Most Comprehensive API for Stocks/Financial Data [closed]
What is the most recommended free/public API for accessing financial market stats and stock quotes (preferrably real-time quotes)? I'm not too picky about how it's exposed (SOAP, REST, some proprietary XML setup, etc.), as long as it's got some decent documentation.
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sqlite3-ruby install error on Ubuntu
I have the following error during sqlite3-ruby install:
19 Answers
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Extracting hours from a DateTime (SQL Server 2005)
I can extract the month and day by using Day(Date()) , Month(Date()) . I can't extract hours, with HOUR(Date()) . I get the following error.
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Convert a negative number to a positive one in JavaScript
Is there a math function in JavaScript that converts numbers to positive value?
16 Answers
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Benchmarking (python vs. c++ using BLAS) and (numpy)
I would like to write a program that makes extensive use of BLAS and LAPACK linear algebra functionalities. Since performance is an issue I did some benchmarking and would like know, if the approach I took is legitimate.
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