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Test for equality among all elements of a single vector
...vector is FP 0.
zero_range <- function(x, tol = .Machine$double.eps ^ 0.5) {
if (length(x) == 1) return(TRUE)
x <- range(x) / mean(x)
isTRUE(all.equal(x[1], x[2], tolerance = tol))
}
If you were using this more seriously, you'd probably want to remove missing values before computing th...
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...索的结果数，而这个结果数，是放在一个Html文本框内。
4．需要快速的添加广告系统代码，如：AdWords，DoubleClick。
以判断页面地址为例：
完全匹配：
if (location.pathname == “/en/list.aspx”) { … }
以某个地址开始的情况，如：/...
How to request a random row in SQL?
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751
See this post: SQL to Select a random row from a database table. It goes through methods for do...
Sorting a vector in descending order
...swered Apr 28 '13 at 20:25
user541686user541686
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Deleting a Google App Engine application
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answered Oct 14 '09 at 18:48
Steve ArmstrongSteve Armstrong
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Regex for splitting a string using space when not surrounded by single or double quotes
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Margin on child element moves parent element
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506
Found an alternative at Child elements with margins within DIVs You can also add:
.parent { o...
Chrome Uncaught Syntax Error: Unexpected Token ILLEGAL [duplicate]
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4 Answers
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How do you scroll up/down on the Linux console?
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245
SHIFT+Page Up and SHIFT+Page Down. If it doesn't work try this and then it should:
Go the ter...
Get next / previous element using JavaScript?
...re?
– Amr Elgarhy
Feb 22 '09 at 13:25
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