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Apply a function to every row of a matrix or a data frame
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182
You simply use the apply() function:
R> M <- matrix(1:6, nrow=3, byrow=TRUE)
R> M
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How to apply a function to two columns of Pandas dataframe
Suppose I have a df which has columns of 'ID', 'col_1', 'col_2' . And I define a function :
12 Answers
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Why does this go into an infinite loop?
...ent(MutableInt x) {
int valueBeforeIncrement = x.intValue();
x.add(1);
return new MutableInt(valueBeforeIncrement);
}
Right? Increment the value passed and return the original value: that's the definition of the postincrement operator.
Now, let's see how this behavior plays out in you...
Store boolean value in SQLite
...torage class. Instead, Boolean values are stored as integers 0 (false) and 1 (true).
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Find the version of an installed npm package
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2691
npm list for local packages or npm list -g for globally installed packages.
You can find the ve...
Suppress Scientific Notation in Numpy When Creating Array From Nested List
...suppress=True), for details see here:
http://pythonquirks.blogspot.fr/2009/10/controlling-printing-in-numpy.html
For SciPy.org numpy documentation, which includes all function parameters (suppress isn't detailed in the above link), see here: https://docs.scipy.org/doc/numpy/reference/generated/nump...
Why does the order of the loops affect performance when iterating over a 2D array?
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You have a 2-dimensional array, but memory in the computer is inherently 1-dimensional. So while you imagine your array like this:
0,0 | 0,1 | 0,2 | 0,3
----+-----+-----+----
1,0 | 1,1 | 1,2 | 1,3
----+-----+-----+----
2,0 | 2,1 | 2,2 | 2,3
Your computer stores it in memory as a single line:
0...
MySQL ERROR 1045 (28000): Access denied for user 'bill'@'localhost' (using password: YES)
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What is the >>>= operator in C?
... compiles and runs. What is this >>>= operator and the strange 1P1 literal? I have tested in Clang and GCC. There are no warnings and the output is "???"
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Sort points in clockwise order?
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195
First, compute the center point.
Then sort the points using whatever sorting algorithm you lik...