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Memoization in Haskell?
... efficiently the following function in Haskell, for large numbers (n > 108)
8 Answers
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XML Schema minOccurs / maxOccurs default values
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The default values for minOccurs and maxOccurs are 1. Thus:
<xsd:element minOccurs="1" name="asdf"/>
cardinality is [1-1] Note: if you specify only minOccurs attribute, it can't be greater than 1, because the default value for maxOccurs is 1.
<xsd:element minOccu...
What do hjust and vjust do when making a plot using ggplot?
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The value of hjust and vjust are only defined between 0 and 1:
0 means left-justified
1 means right-justified
Source: ggplot2, Hadley Wickham, page 196
(Yes, I know that in most cases you can use it beyond this range, but don't expect it to behave in any specific way. This is ou...
Accessing items in an collections.OrderedDict by index
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181
If its an OrderedDict() you can easily access the elements by indexing by getting the tuples o...
Formatting Decimal places in R
I have a number, for example 1.128347132904321674821 that I would like to show as only two decimal places when output to screen (or written to a file). How does one do that?
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App Inventor 2 列表代码块 · App Inventor 2 中文网
...表，子列表的成员本身并不是列表的成员。
例如列表 [1,2,[3,4]] 的成员为1、2，列表[3 4]， 3 和 4 本身不是列表的成员。
求列表长度
返回列表中的项目数。
列表是否为空？
如果列表没有...
What is the difference between int, Int16, Int32 and Int64?
What is the difference between int , System.Int16 , System.Int32 and System.Int64 other than their sizes?
10 Answers
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Is there a JavaScript strcmp()?
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136
What about
str1.localeCompare(str2)
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Moving matplotlib legend outside of the axis makes it cutoff by the figure box
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316
Sorry EMS, but I actually just got another response from the matplotlib mailling list (Thanks g...
导盲项目：什么场景非得用相机预览？按杖上按钮或定时拍照，识别后语音提醒...
...面对视障使用者没有用，但：
布局可以做小（比如高 120 像素放在屏幕顶端），只要可见且有尺寸；
调试时很有用：一眼看出手机有没有对着前方、衣服有没有挡住镜头。
整个系统的数据流：
导盲杖
→ ...