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How to center a “position: absolute” element
...may use:
position: absolute;
margin-left: auto;
margin-right: auto;
left: 0;
right: 0;
text-align: center;
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Fade Effect on Link Hover?
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edited Feb 24 '15 at 7:05
answered May 15 '11 at 12:37
M...
Standardize data columns in R
...have a dataset called spam which contains 58 columns and approximately 3500 rows of data related to spam messages.
15 An...
What is a 'semantic predicate' in ANTLR?
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170
ANTLR 4
For predicates in ANTLR 4, checkout these stackoverflow Q&A's:
Syntax of semantic...
How to find list of possible words from a letter matrix [Boggle Solver]
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+150
My answer works like the others here, but I'll post it because it looks a bit faster than the other Python solutions, from setting up ...
how to check redis instance version?
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310
$ redis-server --version
gives you the version.
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Remove duplicated rows using dplyr
...r below:
library(dplyr)
set.seed(123)
df <- data.frame(
x = sample(0:1, 10, replace = T),
y = sample(0:1, 10, replace = T),
z = 1:10
)
One approach would be to group, and then only keep the first row:
df %>% group_by(x, y) %>% filter(row_number(z) == 1)
## Source: local data fr...
Why is null an object and what's the difference between null and undefined?
...rs♦
839k212212 gold badges32183218 silver badges28092809 bronze badges
answered Apr 29 '09 at 13:31
RobRob
46.1k44 gold badges69...
Iterating over a numpy array
...>>> for (x,y), value in numpy.ndenumerate(a):
... print x,y
...
0 0
0 1
1 0
1 1
2 0
2 1
Regarding the performance. It is a bit slower than a list comprehension.
X = np.zeros((100, 100, 100))
%timeit list([((i,j,k), X[i,j,k]) for i in range(X.shape[0]) for j in range(X.shape[1]) for k...
Looping through array and removing items, without breaking for loop
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edited Dec 8 '17 at 17:03
community wiki
4 r...