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How assignment works with Python list slice?
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4 Answers
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Apply a function to every row of a matrix or a data frame
...:6, nrow=3, byrow=TRUE)
R> M
[,1] [,2]
[1,] 1 2
[2,] 3 4
[3,] 5 6
R> apply(M, 1, function(x) 2*x[1]+x[2])
[1] 4 10 16
R>
This takes a matrix and applies a (silly) function to each row. You pass extra arguments to the function as fourth, fifth, ... arguments to app...
How to randomly sort (scramble) an array in Ruby?
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Built in now:
[1,2,3,4].shuffle => [2, 1, 3, 4]
[1,2,3,4].shuffle => [1, 3, 2, 4]
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deleting rows in numpy array
...thod.
Suppose I have the following array x:
x = array([[1,2,3],
[4,5,6],
[7,8,9]])
To delete the first row, do this:
x = numpy.delete(x, (0), axis=0)
To delete the third column, do this:
x = numpy.delete(x,(2), axis=1)
So you could find the indices of the rows which have a ...
How do I list all versions of a gem available at a remote site?
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Select records from NOW() -1 Day
...efully.
– Jon Skeet
Jul 17 '18 at 7:46
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What is the most efficient way to create a dictionary of two pandas Dataframe columns?
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Subscripts in plots in R
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edited Jun 3 '17 at 11:34
Tom Kelly
8761212 silver badges1616 bronze badges
answered Apr 14 '12 at 19:...
How to trace the path in a Breadth-First Search?
...raph is in adjacent list representation
graph = {
'1': ['2', '3', '4'],
'2': ['5', '6'],
'5': ['9', '10'],
'4': ['7', '8'],
'7': ['11', '12']
}
def bfs(graph, start, end):
# maintain a queue of paths
queue = []
# push the first path into t...
Can I keep Nuget on the jQuery 1.9.x/1.x path (instead of upgrading to 2.x)?
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