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How to implement a queue using two stacks?
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710
Keep 2 stacks, let's call them inbox and outbox.
Enqueue:
Push the new element onto inbox
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Any reason not to use '+' to concatenate two strings?
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There is nothing wrong in concatenating two strings with +. Indeed it's easier to read than ''...
Safely limiting Ansible playbooks to a single machine?
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13 Answers
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How to convert an array of strings to an array of floats in numpy?
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181
Well, if you're reading the data in as a list, just do np.array(map(float, list_of_strings)) (...
Insert into a MySQL table or update if exists
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11 Answers
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undefined reference to boost::system::system_category() when compiling
I'm trying to compile a program on Ubuntu 11.10 that uses the Boost libraries. I have the 1.46-dev Boost libraries from the Ubuntu Repository installed, but I get an error when compiling the program.
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DataTable: Hide the Show Entries dropdown but keep the Search box
...es dropdown but keep the Search box in DataTable? I want to always display 10 rows with pagination at the bottom along with search box but do not want to display the Show entries dropdown.
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从源代码剖析Mahout推荐引擎 - 大数据 & AI - 清泛网 - 专注C/C++及内核技术
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推荐算法工具集
创建自己的推荐引擎构造器
1. Mahout推荐引擎概况
Mahout的推荐引擎，要从org.apache.mahout.cf.taste包说起。
packages的说明：
common: 公共类包括，异常，数据刷新接口，权重常量
eval: 定义构造器接口，...
How to 'insert if not exists' in MySQL?
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10 Answers
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