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How to succinctly write a formula with many variables from a data frame?
...in a formula to mean all the variables, it is the . identifier.
y <- c(1,4,6)
d <- data.frame(y = y, x1 = c(4,-1,3), x2 = c(3,9,8), x3 = c(4,-4,-2))
mod <- lm(y ~ ., data = d)
You can also do things like this, to use all variables but one (in this case x3 is excluded):
mod <- lm(y ~ ...
Load local JSON file into variable
... "0.9685",
"name": " contents:queue"
},
{
"id": "0.79281",
"name": " contents:mqq_error"
}
]
}
You also had an extra }.
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Efficient way to remove keys with empty strings from a dict
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Get time in milliseconds using C#
...nds. By time, I mean a number that is never equal to itself, and is always 1000 numbers bigger than it was a second ago. I've tried converting DateTime.Now to a TimeSpan and getting the TotalMilliseconds from that... but I've heard it isn't perfectly accurate.
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The term 'Update-Database' is not recognized as the name of a cmdlet
I am using EF5 beta1 and while I was able to run the "Update-Database" before. Now that I shut down Visual Studio, I cannot get it to run. I get the following error:
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BSS段、数据段、代码段、堆与栈 剖析 - C/C++ - 清泛网 - 专注C/C++及内核技术
...存区。
【例一】
用cl 编译两个小程序如下：
程序1:
int ar[30000];
void main()
{
......
}
程序2:
int ar[300000] = {1, 2, 3, 4, 5, 6 };
void main()
{
......
}
发现程序2 编译之后所得的.exe 文件比程序1 的要大得多。当下甚为不解，...
Android TextView with Clickable Links: how to capture clicks?
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javascript scroll event for iPhone/iPad?
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147
The iPhoneOS does capture onscroll events, except not the way you may expect.
One-finger p...
Determine if an element has a CSS class with jQuery
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edited Aug 10 '11 at 18:20
Jeff May
44922 silver badges1414 bronze badges
answered Nov 4 ...