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How to force R to use a specified factor level as reference in a regression?
... the relevel() function. Here is an example:
set.seed(123)
x <- rnorm(100)
DF <- data.frame(x = x,
y = 4 + (1.5*x) + rnorm(100, sd = 2),
b = gl(5, 20))
head(DF)
str(DF)
m1 <- lm(y ~ x + b, data = DF)
summary(m1)
Now alter the factor b in DF by use of th...
Is there a way to programmatically scroll a scroll view to a specific edit text?
...e
public void run() {
your_scrollview.scrollTo(0, your_EditBox.getBottom());
}
});
}
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What are the advantages of NumPy over regular Python lists?
... lists -- a list of lists as you describe, in Python, would take at least 20 MB or so, while a NumPy 3D array with single-precision floats in the cells would fit in 4 MB. Access in reading and writing items is also faster with NumPy.
Maybe you don't care that much for just a million cells, but you ...
What is the fastest method for selecting descendant elements in jQuery?
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answered Jul 5 '10 at 7:33
Aaron HarunAaron Harun
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How to specify JVM maximum heap size “-Xmx” for running an application with “run” action in SBT?
... iwein
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answered Oct 29 '10 at 16:59
ArneArne
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Add property to anonymous type after creation
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answered Jul 19 '11 at 20:40
LevitikonLevitikon
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How can I build multiple submit buttons django form?
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answered May 14 '09 at 23:03
Ayman HouriehAyman Hourieh
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Location of parenthesis for auto-executing anonymous JavaScript functions?
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answered Aug 2 '10 at 1:49
meder omuralievmeder omuraliev
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Inherit docstrings in Python class inheritance
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answered Jan 8 '10 at 4:51
John FeminellaJohn Feminella
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Why are C# 4 optional parameters defined on interface not enforced on implementing class?
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UPDATE: This question was the subject of my blog on May 12th 2011. Thanks for the great question!
Suppose you have an interface as you describe, and a hundred classes that implement it. Then you decide to make one of the parameters of one of the interface's methods optional. Are you su...