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...空也报 "Infinity or NaN:Infinity"
以下为对话中 ai2claw 关于此问题的补充调研
用户提问：TextBox输入字符串后，只用"判断为空"积木块（string-empty?），也报错"Infinity or NaN:Infinity"，这是为什么？
ai2claw 分析...
What is /dev/null 2>&1?
I found this piece of code in /etc/cron.daily/apf
7 Answers
7
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Fastest hash for non-cryptographic uses?
I'm essentially preparing phrases to be put into the database, they may be malformed so I want to store a short hash of them instead (I will be simply comparing if they exist or not, so hash is ideal).
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Assume I've got some arbitrary layout of splits in vim.
12 Answers
12
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Can someone explain the traverse function in Haskell?
I am trying and failing to grok the traverse function from Data.Traversable . I am unable to see its point. Since I come from an imperative background, can someone please explain it to me in terms of an imperative loop? Pseudo-code would be much appreciated. Thanks.
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Highlight all occurrence of a selected word?
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15 Answers
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PHP code to convert a MySQL query to CSV [closed]
What is the most efficient way to convert a MySQL query to CSV in PHP please?
6 Answers
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How can I ssh directly to a particular directory?
I often have to login to one of several servers and go to one of several directories on those machines. Currently I do something of this sort:
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Where do I find the line number in the Xcode editor?
In Xcode 3, the line number of the current cursor location was displayed. I don't see this in Xcode 4. Is there a setting that will turn it on? Or a keypress that will give it to me?
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Converting RGB to grayscale/intensity
When converting from RGB to grayscale, it is said that specific weights to channels R, G, and B ought to be applied. These weights are: 0.2989, 0.5870, 0.1140.
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