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How to define a two-dimensional array?
...tems; Python calls this
"list comprehension".
# Creates a list containing 5 lists, each of 8 items, all set to 0
w, h = 8, 5;
Matrix = [[0 for x in range(w)] for y in range(h)]
You can now add items to the list:
Matrix[0][0] = 1
Matrix[6][0] = 3 # error! range...
Matrix[0][6] = 3 # valid
Not...
Find MongoDB records where array field is not empty
...
answered Aug 5 '14 at 15:24
Chris'Chris'
9,06711 gold badge1212 silver badges1313 bronze badges
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How do I list all versions of a gem available at a remote site?
...
205
Well, it was easier than I thought (well, not really, let's say as easy as it should be):
gem l...
Applying a function to every row of a table using dplyr?
...
alexwhanalexwhan
13.8k55 gold badges4545 silver badges6464 bronze badges
...
How to slice an array in Bash
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edited Jul 24 '18 at 16:35
Nicholas Pipitone
3,33511 gold badge1717 silver badges3333 bronze badges
ans...
Bomb dropping algorithm
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5
@beaker, please read the problem carefully. Bombing a square reduces all eight of its neighbors, so his assumption there is actually correct...
How to iterate for loop in reverse order in swift?
...ge in reverse order, they can be used as below:
for index in stride(from: 5, to: 1, by: -1) {
print(index)
}
//prints 5, 4, 3, 2
for index in stride(from: 5, through: 1, by: -1) {
print(index)
}
//prints 5, 4, 3, 2, 1
Note that neither of those is a Range member function. They are global...
What does the ^ operator do in Java?
...rator in Java
^ in Java is the exclusive-or ("xor") operator.
Let's take 5^6 as example:
(decimal) (binary)
5 = 101
6 = 110
------------------ xor
3 = 011
This the truth table for bitwise (JLS 15.22.1) and logical (JLS 15.22.2) xor:
^ | 0 1 ^ | F T
--+----...
Pandas index column title or name
...index name.
– Piotr Migdal
Apr 11 '15 at 20:37
14
it should be possible to specify index name at ...